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

[Nick Desaulniers via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 3
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nickdesaulniers wrote:

oh, I just noticed that there's a llvm/test/CodeGen/MIR/X86/ dir, I should put .mir tests there.

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