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

[Ilya Biryukov via cfe-commits]

ilya-biryukov wrote:

@jansvoboda11 friendly ping. We have seen an increased number of files hitting the source location limits with the compiler form the last months or so, having this change in would really help us reduce the pressure. 

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