[llvm] [LangRef] inline asm: the instructions are treated opaquely (PR #157080)

[via llvm-commits]

gonzalobg wrote:

This PR clarifies what the LangRef intent is.

There is at least one LLVM backend that is "buggy" according to the LangRef intent.
We should open bugs for those as we find them and figure out how to address them on a case-by-case basis.

Merging this PR does NOT immediately tank the performance of any user of such bugs.

https://github.com/llvm/llvm-project/pull/157080