Move VS SDK references to 26127.00

Use property (instead of reflection) now that we've updated to a more recent SDK.

Use an unused accelerator key.

Merge master into post-dev15

# Conflicts:
#	src/Compilers/CSharp/Portable/Binder/Binder_Expressions.cs

Fixes #14202

Always create dedicated InitializerSemanticModel for parameter default value.

Even for cases when the parameter is not part of a type member declaration, i.e. owned by an anonymous method or a local function.
Fixes #16748. Fixes #16374.

Also implement SemanticModel.GetDeclaredSymbol(ParameterSyntax) for parameters of a Local Function.
Fixes # 16757.

Some more automated tests and test cleanup for the PR#16659

* add end to end stack depth test

* add comment explaining test

* switch to verify diagnostics

* turn parallel build off

* check pointer size in addition to debug/release

removed additional cost I can find from trace compared to code before…

Enable Code Fixes in F# (RC3 regression)

https://github.com/dotnet/roslyn/pull/16659

added tests, made the included tuple2 chunk a CData

Fixes #16352

Merge master into post-dev15

Fixes Microsoft/visualfsharp#2329

Implements GetDeclaredSymbol for tuple literals and GetSymbolInfo for elements of tuple literals.

Merge master into post-dev15

# Conflicts:
#	src/EditorFeatures/CSharpTest/CSharpEditorServicesTest.csproj

Merge dev15-rc3 into master

Enable override completion to use expression body accessors

Disallow Rename Tracking on named tuple elements (to match Inline Rename and prevent a crash)

The subsumption tree must treat an unconstrained type parameter as possibly null.
Also, if a previous case pattern handles all non-null input, any further case type pattern is subsumed.
Fixes #16688
Fixes #16671

Fixes #16559

Fixes #10765

They were building as 64-bit only since there wasn't a 32-bit CoreCLR before.