In isUseTriviallyOptimizableToLiveOnEntry, pointsToConstantMemory needs to be
called on the load's pointer operand, not on the result of the load (which
might not even be a pointer).
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@299823 91177308-0d34-0410-b5e6-96231b3b80d8