Richard Sandiford 981fdeb477 [DAGCombiner] Respect volatility when checking for aliases
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.

llvm-svn: 193518
2013-10-28 12:00:00 +00:00
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