Cherry-pick malloc + memset -> calloc optimization #3163
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After this change DSE can eliminate malloc + memset and emit calloc. It's https://reviews.llvm.org/D101440 follow-up. Differential Revision: https://reviews.llvm.org/D103009 (cherry picked from commit 5c315be)
…loc into calloc' transformation FoldMallocMemset can be safely removed because since https://reviews.llvm.org/D103009 such transformation is already performed in DSE. Differential Revision: https://reviews.llvm.org/D103451 (cherry picked from commit f8cdde7)
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