Factor out code into HandleVirtRegDef, for consistency with

Handle{Virt,Phys}Reg{Def,Use}. Remove a redundant check
for register zero, and redundant checks for isPhysicalRegister.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56412 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/CodeGen/LiveVariables.h

@@ -263,6 +263,7 @@ public:
   void MarkVirtRegAliveInBlock(VarInfo& VRInfo, MachineBasicBlock* DefBlock,
                                MachineBasicBlock *BB,
                                std::vector<MachineBasicBlock*> &WorkList);
+  void HandleVirtRegDef(unsigned reg, MachineInstr *MI);
   void HandleVirtRegUse(unsigned reg, MachineBasicBlock *MBB,
                         MachineInstr *MI);
 };