[AArch64][GISel] Use MachineMemoryOperand size when choosing indexed store (#175747) A miss-compile occurs at o2 or above when using GlobalISel. The error occurs due to the GlobalMerge pass moving two variables together & a store of the incorrect size overwriting one of the two merged variables. Currently, `AArch64InstructionSelector` uses the size of LLT when choosing which pre/post indexed store to choose. In this case, the size of the LLT is 32 when the value being stored is 16. By changing this selector to look at the size of the MMO we can avoid this issue. --------- Co-authored-by: Nathan Corbyn <me@nathancorbyn.com>
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