[llvm] [X86] Resolve FIXME: Create cld only when needed (PR #82415)

[Simon Pilgrim via llvm-commits]

RKSimon wrote:

Update the patch description:
"Only use cld when we also have rep instructions or are calling a function."
--> "Only use cld when we also have rep instructions, are calling a function or contain inline asm."?

https://github.com/llvm/llvm-project/pull/82415