[TwoAddressInstruction] Enable machine verification after this pass

[MatzeB]

I'm always happy to see more verifier usage. Let's hope this change sticks. LGTM

llvm/lib/CodeGen/TargetPassConfig.cpp

 bool TargetPassConfig::usingDefaultRegAlloc() const {
   return RegAlloc.getNumOccurrences() == 0;
 }
 
 /// Add the minimum set of target-independent passes that are required for
 /// register allocation. No coalescing or scheduling.
 void TargetPassConfig::addFastRegAlloc() {
   addPass(&PHIEliminationID);
-  addPass(&TwoAddressInstructionPassID, false);
+  addPass(&TwoAddressInstructionPassID);
 
   addRegAssignAndRewriteFast();
 }
 
 /// Add standard target-independent passes that are tightly coupled with
 /// optimized register allocation, including coalescing, machine instruction
 /// scheduling, and register allocation itself.
 void TargetPassConfig::addOptimizedRegAlloc() {
void TargetPassConfig::addOptimizedRegAlloc() {
   // Edge splitting is smarter with machine loop info.
   addPass(&MachineLoopInfoID);
   addPass(&PHIEliminationID);
 
   // Eventually, we want to run LiveIntervals before PHI elimination.
   if (EarlyLiveIntervals)
     addPass(&LiveIntervalsID, false);
 
-  addPass(&TwoAddressInstructionPassID, false);
+  addPass(&TwoAddressInstructionPassID);
   addPass(&RegisterCoalescerID);
 
   // The machine scheduler may accidentally create disconnected components
   // when moving subregister definitions around, avoid this by splitting them to
   // separate vregs before. Splitting can also improve reg. allocation quality.
   addPass(&RenameIndependentSubregsID);
 
   // PreRA instruction scheduling.