[llvm] [clang][X86] X86::LAR X86::LSL add_implicate eflags (PR #80993)

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Qfrost911 wrote:

@pranavk  @MaskRay @KanRobert  Excuse me, I think this is a nice patch, but I don't know to whom reviewer should I turn.

https://github.com/llvm/llvm-project/pull/80993