This allows accessing an SReg subregister with a normal subregister
index, instead of getting a machine verifier error.
Also be sure to include all of these subregisters in SReg_32.
This fixes inferring SGPR instead of SReg when finding a
super register class.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214901 91177308-0d34-0410-b5e6-96231b3b80d8