The DeclarePublicAPI draws attention to changes to the public API
surface area in order to prevent breaking changes and to encourage
careful design when adding new APIs. It requires that every project with
a public API capture the public types and members in a file called
PublicAPI.txt, and creates errors when this file does not match the
actual symbols in the project. This makes changes very obvious in code
reviews and source control history.

Currently PublicAPI.txt does not capture the return types of members
(field, properties, methods, and events) so these can changes without it
being caught by the tool. This changes updates the analyzer to include
the return type.

A nice feature of the associated code fix is that it sorts PublicAPI.txt
alphabetically, and since type names are fully qualified this naturally
groups together types in the same namespace, members in the same type,
overloads, etc. To preserve this property we put the return type at the
end of the line, after the type and member name.

Remove cancellation token from NavigateTo

Delete our copy of IsBuiltInRuleSet

Fix #308 and #306 - issues with dynamic expressions in string interpolation

NavigateTo doesn't support cancellation when computing the display properties so the cancellation token is getting removed rather than having to manually handling OperationCanceledException.

Ensure that FileKey's timestamp is Utc by adding a Debug.Assert
Use LastWriteTimeUtc in MetadataCache.

This change deletes code we use to determine if a rule set file is one
that shipped with VS, and thus cannot be modified or deleted. It was
largely copied from code in
Microsoft.VisualStudio.CodeAnalysis.Sdk.UI.dll, and we should just use
the original instead.

Fix #323 bug in SemanticModel.GetAwaitExpressionInfo when await expression used as an expression statement.

Add the CodeAnalysis analyzers projects back to the Roslyn solution.

Fix #323 bug in SemanticModel.GetAwaitExpressionInfo when await expression used as an expression statement.

It looks like this got lost when the new open Roslyn.sln was created.

Corrected documentation on FullSpan and Span

Small fixes for running suites

The BuildAndTest.proj was failing because a number of our suites aren't
correct when run in parallel.  Disabling them for now and letting #321
track reenabling them.

Enable more suites

The AppDomain loading issue was the root cause of many of the failures
which caused these suites to be disabled.  Now that the bug is fixed we
can move to running these suites again.

Fix Jenkins run

Disabling the HandleSolutionProjectTypeSolutionFolder test as it is
failing in Jenkins.  Filed issue #317 to track this test.

Fix Roslyn.sln build

This makes the necessary changes to allow for Roslyn.sln to build from
the command line.

[git-commit-sha: 10660496] (changeset 1412156)

A bit of cleanup of assembly signing interop interfaces making the code portable. (changeset 1412135)

Fixes a crash while generating debug information for a compilation with two metadata references that represent the same assembly, first with no aliases and second with an alias.   (changeset 1412130)

There are cases where underlying platform does not provide signing services in the form that we consume. We need to be able to handle such cases gracefully without crashes.
***NO_CI***
 (changeset 1412127)

Avoid a couple of VB iterator allocations for emitting custom attributes and interfaces. Combined, this is 0.5% of allocations in the "Roslyn Full" build. (changeset 1412086)

1. Reduce allocations when reading from FileStream.
2. Pre-compute checksum if possible.
3. Reduce allocations for lazily computed checksums.
4. Avoid LOH allocations for large source text.
5. Update EditorTextFactory to optimize for reads from temporary storage

Perf results for the Picasso rebuild scenario:
184 MB total allocations saved. Including: 78 MB of char[], 73 MB of Byte[], 9 MB of string. Also, 35 MB of LOH allocations were eliminated.
 (changeset 1412085)

In a benchmark with 200,000 methods in a type, ChildThatContainsPosition was the clear bottleneck. For such cases, the syntax list is represented using a special type called WithLotsOfChildren (both VB and C# have this optimization) that has a constant-time implementation of GetSlotOffset. Given that, we can find the correct slot via binary search instead of a linear search.
With this change, the benchmark compilation went from 45 seconds to 25 seconds. (changeset 1412034)

CR: jasonmal;joshs;jaredpar;hechang (changeset 1412012)

Move Roslyn.DebuggerVisualizers to open. This project contains VS debugger visualizers of IL, PDB and metadata blobs helful for debugging Roslyn issues. (changeset 1411991)

Disable Microsoft.VisualStudio.LanguageServices.Implementation.EditAndContinue.VsENCRebuildableProjectImpl.TrackingSpansChanged(bool) pending perf investigation (issue #291). (changeset 1411936)

 (changeset 1411873)

No, if you search for something like CS.SK we'll find Microsoft.CodeAnalysis.CSharp.SyntaxKind

We do this by breaking up the original pattern by dots (so, in this case, we'd have "CS" and "SK").  We then do our normal search, looking for symbols that match the last name piece (in this case "SK").  When we find one, we then walk up it's container seeing if each parent container name matches each respective preceding pattern component.  If all pattern parts match, then the symbol is a match and it is returned.
***NO_CI***
 (changeset 1411849)