Skip flaky SolutionTests.TestRecoverableSyntaxTreeVisualBasic until …

implements IProjectCacheHostService in OOP.

workspace will cache everything in memory if this service doesn't exist in workspace. now this being exist, workspace will start to put things such as text, tree, compilation either kick out from memory or save it to temporary storage.

this should reduce memory foot print once things become idle, but this doesn't help memory footprint while feature is running.

with this service, once OOP become idle, memory foot print goes down to about 700MB to 1 GB. but still while code lens run, memory goes up to 3GB.

Merge dev15-rc into master

Use operand.Display property when printing method group types to diagnostics

Only format an open curly if it the first token on a line.

Group spell checking fixes together so we can collapse them if we have a lot of fixes offered.

Fix issue with chained calls in Replace-Method-With-Property.

Serialize out all code style options.

Add default Dev15 location

Merge pull request #14594 from heejaechang/dllloading

Add filters for keywords and snippets.

Don't dismiss intellisense if the user types a number after a dot.

avoid loading dlls not needed

avoid loading dlls not needed

Make RegisterSymbolAction work on Parameters

Revert "Rationalize references for Microsoft.Net.Compilers.netcore (#…

Fix determinism build

Serialize out all code style options.

Fixes #14323
Fixes #14322

Fixing a crash in SuppressDefaultTupleElements

Another instasce of MSBuild not loading our bootstrap compiler.  Bug tracking that is:

    https://github.com/Microsoft/msbuild/issues/1183

closes #14595