Merge the SystemZ subreg_even32 SubRegIndex into subreg_32bit. The SubRegIndices
were overspecified when inheriting sub-subregisters, for instance: R0Q:subreg_even32 = R0Q:subreg_32bit = R0Q:subreg_even:subreg_32bit. This meant that composeSubRegIndices(subreg_even, subreg_32bit) was ambiguous. llvm-svn: 105063
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