[SystemZ] Add `is(LoadFrom|StoreTo)StackSlotPostFE` to SystemZBackend (#132928) As part of an effort to enable instr-ref-based debug value tracking, this PR implements `SystemZInstrInfo::isLoadFromStackSlotPostFE`, as well as `SystemZInstrInfo::isStoreToStackSlotPostFE`. The implementation relies upon the presence of MachineMemoryOperands on the relevant `MachineInstr`s in order to access the `FrameIndex` post frame index elimination. Since these new functions are only meant to be called after frame-index elimination, they assert against the present of a frame index on the base register operand of the instruction. Outside of the utility of these functions to enable instr-ref-based debug value tracking, they also changes the behavior of the AsmPrinter, since it will now be able to properly detect non-folded spills and reloads, so this changes a number of tests that were checking specifically for folded reloads. Note that there are some tests that still check for `vst` and `vl` as folded spills/reloads even though they should be straight reloads. This will be addressed in a future PR. Co-authored-by: Dominik Steenken <dominik.steenken@gmail.com>
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