7330e358f6b5c696fe58a63671e64dc81d92dee8
The commit r225977 uncovered this bug. The problem was that the vectorizer tried to read the second operand of an already deleted instruction. The bug didn't show up before r225977 because the freed memory still contained a non-null pointer. With r225977 deletion of instructions is delayed and the read operand pointer is always null. llvm-svn: 227800
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