[StackFrameLayoutAnalysis] Use target-specific hook for SP offsets (#100386) StackFrameLayoutAnalysis currently calculates SP-relative offsets in a target-independent way via MachineFrameInfo offsets. This is incorrect for some Targets, e.g. AArch64, when there are scalable vector stack slots. This patch adds a virtual function to TargetFrameLowering to provide offsets from SP, with a default implementation matching what is currently used in StackFrameLayoutAnalysis, and refactors StackFrameLayoutAnalysis to use this function. Only non-zero scalable offsets are output by the analysis pass. An implementation of this function is added for AArch64 targets, which aims to provide correct SP offsets in most cases.
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