9e0ca5720b
The pseudo-instruction LCMPXCHG16B_SAVE_RBX is used when RBX serves as frame base pointer. At a very late stage it is then translated into a regular LCMPXCHG16B, preceded by copying the actual argument into RBX, and followed by restoring the register to the base pointer. However, in case the `cmpxchg` operates on a local variable, RBX might also be used as a base for the memory operand in frame finalization, and we've overwritten RBX with the input operand for `cmpxchg16b`. So we have to rewrite the memory operand base to use the saved value of RBX. Fixes #119959.
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