[Sema/Index] Resolve #keyPath components so they get handled by indexing, semantic highlighting, etc. #33245
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Unlike
\keypath
expressions, the components of#keyPath()
expressions weren't being resolved, so the index wouldn't pick up references for their qualifying types/properties. Semantic highlighting, cursor info, etc wouldn't work on them either.Also fixes a code completion bug where it was reporting members from the Swift rather than ObjC side of bridged types (
#keyPath(MyClass.someString.count)
is invalid, butkeyPath(MyClass.someString.length)
is valid).Resolves rdar://problem/61573935