This change adds a new code action to Features layer Suppression fixer to enable Removing suppressions on diagnostics which are suppressed in source by pragma/SuppressMessageAttribute. Additionally, this change also adds a batch fixer to enable removing suppression on multiple/all diagnostics. This functionality will be consumed by the "Remove suppression(s)" context menu for error list selection.

Compiler layer changes to expose suppression info for suppressed diagnostics. This change adds a new public type SuppressionInfo, which is exposed by Diagnostic.GetSuppressionInfo() for suppressed diagnostics.

Add regression test for issue #2470.

Add regression test for issue #1319.

Always use autoinsertionlocation=false from metadata as source

Fix build warning

Add support for bulk suppressing/baselining diagnostics from the error list

1) Add an API to the suppression fix service to create a baseline for a given project/solution
2) Don't show preview changes dialog for baseline operation.

MAS should always disable auto insertion location.

F1 help should search for the names, not types, of properties.

Fixes #4150

Related to #1319.

Don't suggest removing necessary boxing casts in conditional expressions

put TypeRefResolutionError3 and MissingRuntimeHelper as build only er…

Add vbc to linux bootstrap

Binder.BindExtensionMethod – do not reduce extension methods unless the method group is an argument of nameof().

Related to #2470.

Change Linux bootstrap to use csc running on CoreCLR

Rogjt mpw we build a boostrap version of csc and vbc and bootstrap
with those running on Mono. This commit switches us to build a CoreCLR
compatible csc and then running the boostrap on CoreCLR

Right now the full set of Linux CoreCLR runtime assemblies is not
available on NuGet, so we substitute with some assemblies we stash in
our NuGet ZIP package.

Fix bug #5052

Add a new CompilationOption "ReportSuppressedDiagnostics" to enable reporting compiler diagnostics suppressed in source. Note that the command line compilers will report such suppressed diagnostics in the SARIF errorlog file but not on the console output.

This new compilation option was approved by the design team.

Fixes #5216 

Binder.BindExtensionMethod – do not reduce extension methods unless the method group is an argument of nameof().

Fixes #4970.