[llvm] [X86] Recognize POP/ADD/SUB modifying rsp in getSPAdjust. (PR #114265)

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dyung wrote:

> @dyung please update here when you have a reproducer, even if it's not compact. That sounds like a different symptom than the existing issues.

Sorry for the delay, I'm having trouble reducing it without completely breaking the test so I'll see if I can clean it up a bit and post it.

https://github.com/llvm/llvm-project/pull/114265