[PATCH] D93360: [LibCallSimplifier] fold memset(malloc(x), 0, x) to calloc(1, x) if memset is intrinsic

[Judy via Phabricator via llvm-commits]

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this patch want to fix the bug: https://llvm.org/bugs/show_bug.cgi?id=25892

When there is memset in code, llvm might transform memset to llvm.memset.*.
But llvm might not handle this well, so I use this patch to do it.

test:
check-llvm


https://reviews.llvm.org/D93360

Files:
  llvm/lib/Transforms/Utils/SimplifyLibCalls.cpp
  llvm/test/Transforms/InstCombine/memset-1.ll
  llvm/test/Transforms/InstCombine/promot_malloc_and_memset_intrinsic.ll

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