Fix failed assertion 'FPbased == FPbased2' #111787
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…ation merged SP+n and FP-m stores into a single pair-wise store
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When
lvaFrameAddressoptimizes one of the temporary variables (referenced as FP-m) to be placed next to existing SP+n variable (eg.OutgoingArgSpaceat SP+0) we may end up coalescing a pair-wise load/store between them. A previous attempt to handle the case only accounted for thelvaFrameAddressoptimization being applied to both of the variables or neither of them, but it didn't correctly handle the mixed variant.Fixes #111777