The test discovery is hurting our ability to load solutions quickly in
preview builds. Temporarily disabling discovery while this is being
fixed. Will re-enable once we have the fix.

Ensure that we throw the CLR's InsufficientExecutionStackException in…

IDelegateCreationExpression

Merge preview 1 fixes into preview 2

Allow empty CscToolPath

IntroduceField code action should remove trivia as the other IntroduceVariable actions do.

Add IRaiseEventStatement operation for VB

enabling more IOperation tests that used to be skipped

* added debugging info to find out double dispose

* guard from double dispose issue in unit tests

* PR feedbacks

* dotnet/master: (33 commits)
  Test dumper change to include Isimplicit/Language and some formatting change  (#22309)
  Add regression tests for fixed local function crashes (#22470)
  Use error=true in Obsolete attribute on IsByRefLikeAttribute for ref struct (#22492)
  Add tests with ref readonly and ref assemblies (#22419)
  Add test for sequence point issue with local function and conditional (#22499)
  Keep ProjectState._documentStates sorted rather than resorting the IDs
  Throttle NFW watson. (#22483)
  Suggest "in" for argument positions in IDE (#22480)
  Disable unboxing and generic conversions to/from ref-like types (#22357)
  Hold DocumentIds in ProjectState in ImmutableLists
  Fix bug in build-utils Ensure-SdkInPathAndData
  Add additional tests around Span escaping (#22413)
  Turn on the compiler server by default for the compiler VSIX (#22473)
  add 64bit detect code to razor remote host client (#22432)
  Fix a bug in escape analysis related to 'in' arguments (#22457)
  Ref must come before 'partial' in a 'ref partial struct' (#22403)
  Address PR feedback
  Ensure partial method implementation is completed when needed (#22414)
  Remove PROTOTYPE markers from "private protected" feature (#22407)
  added IVariableDeclarationStatement back to for loop's before condition (#22358)
  ...

* PdbValidationOptions

* Validate converted PDBs

* Add path mapping

* PR feedback