Cleanup ImmToIdxMap and noImmForm in PPCRegisterInfo
ImmToIdxMap should be a DenseMap (not a std::map) because there is no ordering requirement. Also, we don't need a separate list of instructions for noImmForm in eliminateFrameIndex, because this list is essentially the complement of the keys in ImmToIdxMap. No functionality change intended. llvm-svn: 178450
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