disabled some assert for IOperation tests to pass. once this issue is handled - https://github.com/dotnet/roslyn/issues/21180 - they should be re-enabled.

expose Root from SemanticModel
shared same test methods between C# and VB
removed DEBUG region and used foreach
added clone test for c# and vb
use ArrayBuild as Stack

Added IDynamicMemberReferenceExpression

Move feature/ioperation branch to latest analyzers package

* Adding ioperation tests for ForloopStatement

* Addressing the feedback

Merge master to features/ioperation

Preserve leading directives when removing an unused variable.

Merge dev15.3.x to master

# Conflicts:
#	build/Targets/Versions.props
#	src/VisualStudio/Core/Test.Next/VisualStudioTest.Next.csproj
#	src/Workspaces/CoreTest/ServicesTest.csproj
#	src/Workspaces/CoreTestUtilities/WorkspacesTestUtilities.csproj

Better handle null literal arguments when determining what parameter to add to a constructor.

Merge conflict fixes

* dotnet/features/ioperation:
  Changing the IOperation unit test dumper to visit certain operation explicitly. (#20944)

Bump the version to 2.3.2

Crash on dispose

* Changing the dumper to get of calling base.Visit when not needed

* Getting rid of cobyrc file

* Adding copyright header

* fixing merge conflict