Convert TopLevelNullability on BoundNode to use the public Nullability enum instead of NullableAnnotation.

Bail on null type information in GenerateDeconstructMethodCodeFixProvider

Remove redundant pattern check

Verifying a number of NRT bugs are fixed

Document the initial public API design for Nullable Reference Types

Update DocComment on UnassignedAddressTakenVariablesWalker

closes #30034

closes #30033

closes #30031

closes #28324

They were previously on C# 7.0 due to our reliance on new types. That
went away when we moved to the new pragma based design.

closes #30030

Merge dev16.0-preview3 to master

Merge pull request #32813 from jasonmalinowski/fix-metadata-references-not-always-having-file-watchers

Fix bug where references didn't always have a file watcher

Merge dev16.0-preview3 to master

Hardcode the optprof drop to the last known good build

Regression test for 32503

Merge dev16.0-preview3 to master

Issue 32480 - Don't suggest adding braces with interceding compiler directive

Add 16.0-preview3 branches to publish and azure pipelines

this will make clean up to happen faster. this is following existing pattern of remove things faster and show up things slower pattern we have been using on squiggles.

impact on user expierence will be like errors from error list or todo comments on todo list goes away faster when document is removed or project is removed from solution.

mitigating https://github.com/dotnet/roslyn/issues/30577

Account for both parts of partial methods while computing dependent s…