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

[Richard Smith via cfe-commits]

zygoloid wrote:

> Unfortunately with this patch I'm still seeing the same source-location-exhausted error.

Can you try applying #89428 as well? I think we would need both in order to prune the module map from the serialized SLocEntries.

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