[clang] [clang][Tooling] Fix `getFileRange` returning a range spanning across macro arguments (PR #169757)

[Eric Li via cfe-commits]

tJener wrote:

Had not realized that auto-merge would merge once tests finished running; I had assumed it'd be triggered by reviewer LGTM. That said, if you have any comments I can address them in a separate commit.

https://github.com/llvm/llvm-project/pull/169757