Don't advertise we support hover, handled by liveshare

Fix cases where we would not simplify in a using alias.

Fixed IDE0009 suggestion in property pattern.

Ensure that we don't kick off SolutionCrawler's Reanalyze functionali…

This will cause local Visual Studio and VS Code test runners to run under
CoreCLR by default. This will only affect tests which are multi-targeted,
which today only includes the compiler unit tests.

Merge pull request #40862 from dotnet/revert-35979-improve-code-gen-readonly-generic-conditional-access

Revert "Improve the code gen for a conditional access on a readonly unconstrained field"

* Remove unused parameter and clean up MemoryMappedInfo

Ensure that we don't kick off SolutionCrawler's Reanalyze functionality if solution crawler is turned off with the option `InternalSolutionCrawlerOptions.SolutionCrawler`.

This is needed for our internal RPS performance tests which intend to turn off solution crawler for certain scenarios to reduce noise from it.

Null annotate Quick Info

Add EnumCastDefinitelyCantBeRemoved edge case for casts to numeric types

Don't produce multiple redundant spans for crefs.

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20061.1

- Microsoft.DotNet.Arcade.Sdk - 5.0.0-beta.20060.4

Use appropriate code fix title for IDE0059 for unnecessary compound a…

Fix special handling of Winforms Reset method in IDE0051 (RemoveUnuse…

My previous fix to #30887 added special handling for special Winforms  method with prefix "ShouldSerialize" or "Reset". However, I incorrectly required both these methods to have boolean return type, while only the former should have boolean return. Reset methods needs to be void returning. This change fixes this case.

Fixes #38491 reported on developer community for this bug.

Update AnalyzerRunner to include a netcoreapp3.0 target

Mostly straightforward annotation. The SymbolComparer is deleted because
the code was unused.