[clang] [llvm] [Clang][PCH] Use metadata for embedding AST (PR #214135)

[Steffen Larsen via llvm-commits]

steffenlarsen wrote:

> It would be cleaner to split the LLVM and Clang patches into two separate commits.

I can split it up, no problem. My primary worry is that the final design is still in discussion and if it is split, the discussions could run in parallel in both patches and potentially diverge. Would it be alright if I split it after we agree on the design?

https://github.com/llvm/llvm-project/pull/214135