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

[Jacob Lifshay via llvm-commits]

programmerjake wrote:

> I think that's already implied... not sure if it is worth listing this as an explicit non-exception (if we list all non-exceptions we'll be here for a while ;).

not necessarily, because if you're thinking about overwriting code, zero bytes are always zero bytes, so could be assumed to have no effect. so I think we should explicitly state otherwise.

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