[clang] [Clang][HTO] Add clang attribute for propagating llvm-level information (PR #83059)

[William Moses via cfe-commits]

wsmoses wrote:

So my understanding was that the annotate attribute didn't modify codegen (and thus LLVM string attributes), but perhaps I didn't use it properly.

Is there any reference for that?

https://github.com/llvm/llvm-project/pull/83059