* Use Microsoft.SourceLink.GitHub 1.0.0-beta-63001-01

* Workaround XAML bug

* Fix CommitHashAttribute

* Update compiler package to 2.9.0-beta7-63018-03

* SymLink .git directory for 2nd deterministic build

* Orchestrated build dependency uptake

* Remove duplicate NuGetPackageRoot definition

Update XliffTasks to the latest version. Notably, this version produces
better MSBuild error messages when a .xlf file can't be loaded as XML.

This updates the resource DLL which corrects the version of mscorlib for
the net45beta resource.

Fixes https://github.com/dotnet/roslyn/issues/23424

Allows the compiler extension to work with CPS based projects

Update to the latest version of XliffTasks. This version has fixes for the targets for sorting .xlf files and checking that all resources are translated so that they work properly on projects targeting multiple frameworks.

This copies our VSTS YAML file into dev15.7.x. This changes nothing
about our official build in this branch. It just seeds it with the
correct value and lets the merge bots move it to the rest of the trees.

The official switch over for 15.7 will happen at a later time and will
be very deliberate.

This reverts commit ea88bb13.

Update to the latest version of XliffTasks. Notably, this version
attemps to insert new `trans-unit` elements into .xlf files in a sorted
order rather than always putting them at the bottom. This should help
reduce merge conflicts.

This designation will allow Visual Studio to kill instances of
VBCSCompiler rather than showing it as blocking update installation.

closes #24610

Need to generate a binary log during signing so we can understand why
our builds are failing when new signing is enabled.

This fixes issues where CreatePkgDef needs to get a long command line
longer than the usual Windows limit.

This change moves the MSBuildWorkspace tests to a separate project and introduces infrastructure to get them
running. Essentially, each test is marked with a `ConditionalFact` with `VisualStudioMSBuildInstalled` as the
skip condition. That skip condition uses the VS 2017 setup APIs to locate installed instances of VS and finds
one that contains the Roslyn Compiler package. Then, it sets up an AssemblyResolve event on the current AppDomain
to resolve MSBuild locations from VS itself. This ensures that MSBuild can locate a toolset containing the
necessary props and targets to handle the projects in our tests.

* Active Statement Handling

* Start active statement tracking on background thread

* Ensure XAPI is initialized before calling Concord APIs.

* Fix up and add comments

* Call UninitializeThread in VisualStudioActiveStatementProvider

* Fixes

* PR feedback

* Use dispose pattern for debugger thread initialization

* Finish test

* PR feedback

* Do not track active statements in projects that do not support Roslyn EnC service (e.g. F#)

* Update comment.

* EnC: Report diagnostics for unexpected recoverable exceptions.

* Tweak NFW reporting

* Account for workspace changes in ActiveStatementTagger

* Unsubscribe event in dispose

* Fix initialization of non-remappable regions for unchanged AS in updated method

* Keep non-remappable regions from previous edit session if no edits were made.

* Update xlfs

* Avoid double-free on cancellation

* Avoid calling DkmWorkList.Cancel for now

* Handle active statement without location

Directory.Build.props and Directory.Build.targets are handled by the
project system, so are not included in this change.

* Remove duplicate lock DocumentState.s_syntaxTreeToIdMapLock

This lock is only being used to protect access to an instance which contains
internal synchronization.

* Better handle surrounding directives when inlining a local variable.

* Add tests.

* Share code between VB and C#.

* Reduce allocations in UnboundLambda

Fixes #23463

* Restore ReturnInferenceCacheKey as the key for _returnInferenceCache

* Update code to more closely follow patterns of the original code

* Cleanup from code review

* Verify MSBuild version in Developer CMD prompt

Roslyn is designed to have the simplest possible contribution story:
clone then build. Every pre-req needed is either located on the machine
or bootstrapped via NuGet. All the way down to using an xcopy MSBuild if
needed.

The one case which causes a problem is the VS command prompt. In this
case MSBuild is pre-installed on the machine and may or may not be
suitable for building Roslyn.

Previously when building from a VS command prompt we just used whatever
MSBuild was provided. The assumption being a developer command prompt
was an explicit statement of whath MSBuild you wanted to use. Based on
all of our customer reports though this does not seem to be the
assumption that consumers of our repo have. The build gave them no
explicit errors about the provided toolset and hence when the build
failed they assigned flakiness to our repo.

Going forward we are applying the same version validation to MSBuild
when provided via a developer command prompt. If it doesn't match we
will refuse to build asking the user to upgrade VS or build from a
normal command prompt.

* Remove unneeded debugging line

* Comment about pre-release

* Added minimum version

* Add Omit If Default style option

* Add space to be like test without the omit

* Add/Remove without needing a property

* Reformat

* PR feedback

* Fix VB diagnostic based on feedback

* Handle case of NotApplicable modifier and field declaration list

* Fix tests

* PR feedback

* PR feedback

* Support negative null-check when we are suggesting to inline type checks

Fixes #21097
Fixes #24286

* fix a case where persistent storage registration fails and some clean… (#24458)

* fix a case where persistent storage registration fails and some clean up code around it.

* added readonly

* address PR feedback

* removed comments no longer relevant

* renamed lock name

* moved waiter from diagnostics.dll to features.dll where all interfaces are defined. (#24512)

* put listener change back in (https://github.com/dotnet/roslyn/pull/24120)

* leave old types in legacy folder until partner teams move to new interface

* added legacy waiter to support partner teams

* Remove methods indirecting access to _metadataFileNameToConvertedProjectReference

This field is documented as being written and read from any thread,
but in practice all uses are guarded by an AssertIsForeground(). Thus
we can get rid of the helper methods that are trying to "help" by
locking before accessing the fields, making it really hard to track all
the real uses of it.

* Make method static that doesn't need state

* Fix up tests of P2P to metadata reference conversion

It turns out we had some tests, but the tests were disabled. This was
because the tests weren't working properly anyways: they were calling
into UpdateProjectBinPath which only updated some (but not all) of
the project state. That was an internal helper method that shouldn't
be used by tests. Updating the tests to use
SetBinOutputPathAndRelatedData works better.

* Delete debug-only reference validation

This was some legacy code that tried to verify that the references
we have from the project system match up to what DTE and other sources
say. This was debug-only, and the actual asserts were commented out.
This is deadweight at this point, so delete it.

* added and cleaned up logs around build and live diagnostics. (#24551)

also added RoslynActivityLogger that can be enabled through project-system-tool

* Avoid closure allocations on the BindSyntaxTreeToId fast path

* CS1628 error text mentions in parameters; fixes #24584

* Update optimization data to 2.7.0-beta3-62526-01...

* Small cleanup of completion logic.

* Locate implementations for reference assemblies using the process binding path

* Use GlobalAssemblyCache helper to locate assemblies directly in the GAC

* Update InteractiveEditorFeatures to account for a second definition of GlobalAssemblyCache

* Move to xunit.console for CoreClr tests

Previously we were using xunit.console for desktop tests and dotnet-xunit for our
CoreClr tests. This change unifies us on top of xunit.console (now that it has a
netcoreapp2.0 version available).

* Move unix builds to xunit.runner.console as well

* Fixes 559223

Fix and re-enable test that would catch this error

* Update LanguageServices training data again...

* Get actual directory name, not file

* Fix dir name issue

* Cleanup based on code review feedback

* Check fully-qualified names for SuppressIldasmAttribute and ReferenceAssemblyAttribute
* Use correct reference location, or fail decompilation if it's not available

* Fix typo...

* Don't use inferred member name if that creates duplicates (#24632)

* Fixes #23983

* Added test for unique IDEDiagnosticIDs

* Fixed capitalization on local variable

* Fix `is` and pattern-matching behavior in presence of implicit UD conversion (#24547)

* Fix `is` and pattern-matching behavior in presence of implicit UD conversion
and also an explicit reference conversion. User-defined conversions should
never be considered for `is` and pattern-matching.
Fixes #24522