[clang] [llvm] [clang][Modules][Serialization] Avoid serializing duplicate source location entries for shared input files (PR #209795)

[Chuanqi Xu via cfe-commits]

ChuanqiXu9 wrote:

How do you calculated Loaded source-location space? Is it accumlative of reduced loaded memory?

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