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

[Patrick Simmons via llvm-commits]

linuxrocks123 wrote:

@RalfJung how about this: `The compiler may analyze the contents of the inline asm string in order to optimize surrounding code, but the compiler will always emit the inline asm string verbatim.  Additionally, the compiler will not use any analysis of the inline asm string to optimize the code in violation of any flags, operand constraints or attributes placed on the inline asm call.`

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