Move the 'ResolveLocationInAST' function from the Frontend library to the Index library.

Also, cut down its comments; more comments will be added to ASTLocation.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@74860 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed