[libclang] Introduce clang_findReferencesInFile which accepts a cursor, a file,
and a callback and finds all identifier references of the cursor in the file.

rdar://7948304

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@141277 91177308-0d34-0410-b5e6-96231b3b80d8
12 files changed