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

[Daniel Zabawa via llvm-commits]

daniel-zabawa wrote:

@bjope - my apologies as I had missed the recent email notifications. The current reproducer is fine.

The only change related to hasPushSequences was to add the serialization as there was no other reliable way to recreate the situation in MIR. That may well have exposed something below. Thanks @phoebewang for reverting.

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