[clang] [clang] Fix sorting module headers (PR #73146)

[Tulio Magno Quites Machado Filho via cfe-commits]

tuliom wrote:

OK. I modified this PR in order to only make the changes that fix #73145 .
Sorting will remain broken as it has been since 2021. I will provide another PR after this one gets merged.

https://github.com/llvm/llvm-project/pull/73146