Update codeanalysis for genfacades to support new language features #6971
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Currently if someone tries to use C# 9.0 language features genfacades doesn't parse the syntax tree correctly and could lead to problems, i.e, when adding an attribute to a local function in
PriorityQueue
it causes the parent ofPriorityQueue.UnorderedItemsCollection
to be aCompilationUnitSyntax
instead of aClassDeclarationSyntax
, causing:I tested this on dotnet/runtime and apparently now MSBuild loads tasks in it's own AssemblyLoadContext so now we don't have the restriction of matching the roslyn version that MSBuild depends on. This was fixed on: dotnet/msbuild#4916
cc: @ericstj @stephentoub @Anipik