[clang] [clang][modules] HeaderSearch::MarkFileModuleHeader creates extra HeaderFileInfo, breaks PCM reuse (PR #89005)

[Ian Anderson via cfe-commits]

ian-twilightcoder wrote:

> Unfortunately with this patch I'm still seeing the same source-location-exhausted error. I'm going to try to understand why...

Damn I really thought that was going to be the one. If you have any way I could reproduce or better write a test that would be great.

https://github.com/llvm/llvm-project/pull/89005