This PR fixes speculative-T completion for the return type of local
functions. However, it doesn't include completion for generic arguments
to async local functions, which will require a significant change in the
parsing strategy and tree produced.

Fixes #13480.

Create an ExecutableCodeBinder when speculatively binding an expression or attribute.
Fixes #14384

porting 3 PR to dev15-rc - sharing checksum and enabling oop by default

the way we added cancellation support to StreamJsonRpc can cause ObjectDisposedException from happening.

Propagate InvolvesNarrowingFromNumericConstant flag for tuple conversions.

enable remost host by default

separated checksum creation from ISolutionSynchronizationService

Fix issue where we overly aggressively removed xml doc comment trivia.

Fixes #13436

Related to #14255.
Fixes #14473.

Use Guid constructor instead of Guid.Parse...

Validate our bootstrap build phase

Fix finding of event-parameters after the recent compiler API change.

Deal with a cancellation exception being thrown through a sync-path in navigate-to.

Fixes #12550.

...for dynamic analysis instrumentation.  Guid.Parse is not available when
targeting .NET 2.0/3.5.

Be resilient to being called while the text view is being initialized.

Add support for AB testing in Roslyn.