[clang] [llvm] [clang][serialization] Deduplicate source location entries across loaded modules (PR #209795)

[Ayokunle Amodu via cfe-commits]

ayokunle321 wrote:

> Can you measure the file stat count before and after?

Done. Added the table to the gist linked in the description.

https://github.com/llvm/llvm-project/pull/209795