[clang] [WIP][Safe Buffers] Serialize unsafe_buffer_usage pragmas (PR #92031)

[Ziqing Luo via cfe-commits]

ziqingluo-90 wrote:

Learned more about how loaded files & ASTs are managed in clang.   Now opt-out regions in a loaded AST can span over multiple files (within one TU).  They now behave in a consistent way when they are from loaded files or local files.

https://github.com/llvm/llvm-project/pull/92031