It's not descriptive enough and it's just a call of translateFileLineCol()
followed by a call to getMacroArgExpandedLocation(), which is better to be
called explicitly since it has a certain cost and is not always required.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@140520 91177308-0d34-0410-b5e6-96231b3b80d8