[libclang] Make token annotation of type/storage qualifiers accurate.

[libclang] Make token annotation of type/storage qualifiers accurate.

Previously type/storage qualifiers would not be annotated as the declaration they belonged to.
Just use the resulting source range of getRawCursorExtent() which is more correct
than what AnnotateTokensWorker::Visit() was adjusting it to.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@171774 91177308-0d34-0410-b5e6-96231b3b80d8