[clang] [clang] Add source range to 'use of undeclared identifier' diagnostics (PR #117671)

[Timm Baeder via cfe-commits]

tbaederr wrote:

I knew there was something oddly familiar about this: https://reviews.llvm.org/D150191?id=521215 :man_facepalming: 

https://github.com/llvm/llvm-project/pull/117671