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0ef99720c5
lhbrx and lwbrx not only load their data with byte swapping, but also clear the upper 32 bits (at least). As a result, they can be added to the PPCISelDAGToDAG peephole optimization as frontier instructions for the removal of unnecessary zero extensions. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225189 91177308-0d34-0410-b5e6-96231b3b80d8