[clang] [ASTWriter] Detect more non-affecting FileIDs to reduce source location duplication (PR #112015)

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

> looks good to me.

Thanks!

> Please leave some time to @jansvoboda11

Will do, @jansvoboda11 PTAL when you have a spare minute.

https://github.com/llvm/llvm-project/pull/112015