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

[Eli Friedman via llvm-commits]

https://github.com/efriedma-quic commented:

See also #110510 .

Maybe we should explicitly state this is a superset of "sideeffect", since synchronizing with other threads basically allows arbitrary effects.

Do you anticipate any transforms need to be changed based on this?

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