DAG: Avoid comparing Register to unsigned 0 (#155164)

Author: arsenm

llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp

@@ -238,7 +238,7 @@ void InstrEmitter::CreateVirtualRegisters(SDNode *Node,
 
     // Create the result registers for this node and add the result regs to
     // the machine instruction.
-    if (VRBase == 0) {
+    if (!VRBase) {
       assert(RC && "Isn't a register operand!");
       VRBase = MRI->createVirtualRegister(RC);
       MIB.addReg(VRBase, RegState::Define);