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[SPARC] Mark the %g0 register as constant & use it to materialize zeros
Materialize zeros by copying from %g0, which is now marked as constant. This makes it possible for some common operations (like integer negation) to be performed in fewer instructions. This continues @arichardson's patch at D132561. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D138887
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