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[AArch64][GlobalISel] Use wzr/xzr for 16 and 32 bit stores of zero
We weren't performing this optimization on 16 and 32 bit stores. SDAG happily does this though. e.g. https://godbolt.org/z/cWocKr This saves about 0.2% in code size on CTMark at -O3. Differential Revision: https://reviews.llvm.org/D84568
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Jessica Paquette
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Jul 25, 2020
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