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

[Ralf Jung via llvm-commits]

RalfJung wrote:

The "self-modifying code" part is a clarification/motivated stated at the end. The main point is:
> The compiler may not assume that the actual code executed at runtime matches the
contents of the template string.

This clearly includes the empty string as well.

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