[llvm] [X86InstrInfo] support memfold on spillable inline asm (PR #70832)

[Nick Desaulniers via llvm-commits]

nickdesaulniers wrote:

might need to rebase this on https://github.com/llvm/llvm-project/pull/72910 to get a clean CI presubmit run

https://github.com/llvm/llvm-project/pull/70832