[llvm] [LangRef] asm clobber constrains: '~memory' allows reads and synchronization (PR #150191)

[Ralf Jung via llvm-commits]

RalfJung wrote:

Ah, I see.

Purely formally I could imagine `sideffect` and `~memory` being entirely orthogonal. But I'm not sure if that would actually be practically useful. Do analysis currently treat `~memory` as basically implying `sideeffect`?

https://github.com/llvm/llvm-project/pull/150191