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Making useAA() default to true for SystemZ showed that the combiner alias analysis wasn't handling volatile accesses. This hit many of the SystemZ tests, but I arbitrarily picked one for the purpose of this patch. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@193518 91177308-0d34-0410-b5e6-96231b3b80d8