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0a4fed949e
DSE would mistakenly remove store (2):
a = calloc(n+1)
for (int i = 0; i < n; i++) {
store 1, a[i+1] // (1)
store 0, a[i] // (2)
}
The fix is to do PHI transaltion while looking for clobbering
instructions between the store and the calloc.
Reviewed By: efriedma, bjope
Differential Revision: https://reviews.llvm.org/D68006
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