[AntiDepBreaker] Use MCRegister. NFC

This matches the type passed by AggresssiveAntiDepBreaker and
CriticalAntiDepBreaker.

Author: topperc

llvm/include/llvm/CodeGen/AntiDepBreaker.h

@@ -56,7 +56,7 @@ class AntiDepBreaker {
 
   /// Update DBG_VALUE or DBG_PHI if dependency breaker is updating
   /// other machine instruction to use NewReg.
-  void UpdateDbgValue(MachineInstr &MI, unsigned OldReg, unsigned NewReg) {
+  void UpdateDbgValue(MachineInstr &MI, MCRegister OldReg, MCRegister NewReg) {
     if (MI.isDebugValue()) {
       if (MI.getDebugOperand(0).isReg() &&
           MI.getDebugOperand(0).getReg() == OldReg)
@@ -73,7 +73,7 @@ class AntiDepBreaker {
   /// Update all DBG_VALUE instructions that may be affected by the dependency
   /// breaker's update of ParentMI to use NewReg.
   void UpdateDbgValues(const DbgValueVector &DbgValues, MachineInstr *ParentMI,
-                       unsigned OldReg, unsigned NewReg) {
+                       MCRegister OldReg, MCRegister NewReg) {
     // The following code is dependent on the order in which the DbgValues are
     // constructed in ScheduleDAGInstrs::buildSchedGraph.
     MachineInstr *PrevDbgMI = nullptr;