[AArch64][SME] Fix ADDVL addressing to scavenged stackslot. (#109674) In https://reviews.llvm.org/D159196 we avoided stackslot scavenging when there was no FP available. But in the case where FP is available we need to actually prefer using the FP over the BP. This change affects more than just SME, but it should be a general improvement, since any slot above the (address pointed to by) FP is always closer to FP than BP, so it makes sense to always favour using the FP to address it when the FP is available. This also fixes the issue for SME where this is not just preferred but required.
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