Finish moving TargetRegisterInfo::isVirtualRegister() and friends to llvm::Register as started by r367614. NFC

llvm-svn: 367633
diff --git a/llvm/lib/Target/AMDGPU/GCNNSAReassign.cpp b/llvm/lib/Target/AMDGPU/GCNNSAReassign.cpp
index 51c4c99..c944601 100644
--- a/llvm/lib/Target/AMDGPU/GCNNSAReassign.cpp
+++ b/llvm/lib/Target/AMDGPU/GCNNSAReassign.cpp
@@ -174,7 +174,7 @@
   for (unsigned I = 0; I < Info->VAddrDwords; ++I) {
     const MachineOperand &Op = MI.getOperand(VAddr0Idx + I);
     unsigned Reg = Op.getReg();
-    if (TargetRegisterInfo::isPhysicalRegister(Reg) || !VRM->isAssignedReg(Reg))
+    if (Register::isPhysicalRegister(Reg) || !VRM->isAssignedReg(Reg))
       return NSA_Status::FIXED;
 
     unsigned PhysReg = VRM->getPhys(Reg);