removed unnecessary GetEffectiveDiagnostics call for diagnostics from CompilationWithAnalyzers and other code clean up.

added some comments, code clean up and rename.

changed test to use GetDiagnosticsAsync rather than GetProjectDiagnosticsAsync

Revert targets

This reverts commit 76881584.

This reverts commit e6ba0e1b.

This reverts commit 2179c9d6.

Fix assert in DiagnosticAnalyzerDriver to account for suppressed anal…

fix standalone perftests

Call ITextUndoHistoryRegistry.TryGetHistory

.targets files refactoring

Introduce internalBootstrap.csx to bootstrap internal users

Update DSR.PortablePdb to rc2-24008

Update to -rc2-24008

Completion sometimes runs in buffer that haven't been registered for undo
with the editor, causing ITextUndoHistoryRegistry.GetHistory to throw an
exception. Call TryGetHistory to avoid the exception.

Update language feature status.

Fix assert in DiagnosticAnalyzerDriver to account for suppressed analyzers which are not passed to CompilationWithAnalyzers.

Make tests their own first class objects

Format conflicts resolved during rename

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