remove dead code in parseRegisterList checking for ARM::RA_AUTH_CODE

[stuij]

fix typo

[RKSimon]

LGTM - cheers

llvm/lib/Target/ARM/AsmParser/ARMAsmParser.cpp

if (Parser.getTok().is(AsmToken::Minus)) {
       // Allow Q regs and just interpret them as the two D sub-registers.
       if (ARMMCRegisterClasses[ARM::QPRRegClassID].contains(EndReg))
         EndReg = getDRegFromQReg(EndReg) + 1;
       // If the register is the same as the start reg, there's nothing
       // more to do.
       if (Reg == EndReg)
         continue;
       // The register must be in the same register class as the first.
-      if ((Reg == ARM::RA_AUTH_CODE &&
-           RC != &ARMMCRegisterClasses[ARM::GPRRegClassID]) ||
-          (Reg != ARM::RA_AUTH_CODE && !RC->contains(Reg)))
+      if (!RC->contains(Reg))
         return Error(AfterMinusLoc, "invalid register in register list");
       // Ranges must go from low to high.
       if (MRI->getEncodingValue(Reg) > MRI->getEncodingValue(EndReg))
         return Error(AfterMinusLoc, "bad range in register list");
 
       // Add all the registers in the range to the register list.
       while (Reg != EndReg) {
         Reg = getNextRegister(Reg);