[ARM] Fix bogus assertions in copyPhysReg v8.1-M cases.

[simon_tatham]

Summary

The code to generate register move instructions in and out of VPR and
FPSCR_NZCV had assertions checking that the other register involved
was a GPR _pair_, instead of a single GPR as it should have been.

[miyuki]

LGTM

llvm/lib/Target/ARM/ARMBaseInstrInfo.cpp

// Fall back to VMOVD.
     SubRegs = 2;
   } else if (SrcReg == ARM::CPSR) {
     copyFromCPSR(MBB, I, DestReg, KillSrc, Subtarget);
     return;
   } else if (DestReg == ARM::CPSR) {
     copyToCPSR(MBB, I, SrcReg, KillSrc, Subtarget);
     return;
   } else if (DestReg == ARM::VPR) {
-    assert(ARM::GPRPairRegClass.contains(SrcReg));
+    assert(ARM::GPRRegClass.contains(SrcReg));
     BuildMI(MBB, I, I->getDebugLoc(), get(ARM::VMSR_P0), DestReg)
         .addReg(SrcReg, getKillRegState(KillSrc))
         .add(predOps(ARMCC::AL));
     return;
   } else if (SrcReg == ARM::VPR) {
-    assert(ARM::GPRPairRegClass.contains(DestReg));
+    assert(ARM::GPRRegClass.contains(DestReg));
     BuildMI(MBB, I, I->getDebugLoc(), get(ARM::VMRS_P0), DestReg)
         .addReg(SrcReg, getKillRegState(KillSrc))
         .add(predOps(ARMCC::AL));
     return;
   } else if (DestReg == ARM::FPSCR_NZCV) {
-    assert(ARM::GPRPairRegClass.contains(SrcReg));
+    assert(ARM::GPRRegClass.contains(SrcReg));
     BuildMI(MBB, I, I->getDebugLoc(), get(ARM::VMSR_FPSCR_NZCVQC), DestReg)
         .addReg(SrcReg, getKillRegState(KillSrc))
         .add(predOps(ARMCC::AL));
     return;
   } else if (SrcReg == ARM::FPSCR_NZCV) {
-    assert(ARM::GPRPairRegClass.contains(DestReg));
+    assert(ARM::GPRRegClass.contains(DestReg));
     BuildMI(MBB, I, I->getDebugLoc(), get(ARM::VMRS_FPSCR_NZCVQC), DestReg)
         .addReg(SrcReg, getKillRegState(KillSrc))
         .add(predOps(ARMCC::AL));
     return;
   }
 
   assert(Opc && "Impossible reg-to-reg copy");