Subzero: Minor refactoring/additions in preparation for phi edge splitting.

src/IceCfgNode.cpp

 //===- subzero/src/IceCfgNode.cpp - Basic block (node) implementation -----===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 // This file implements the CfgNode class, including the complexities
@@ skipping 488 matching lines @@
   for (InstPhi *Phi : Phis) {
     if (Phi->isDeleted())
       continue;
     // Emitting a Phi instruction should cause an error.
     Inst *Instr = Phi;
     Instr->emit(Func);
   }
   for (Inst *I : Insts) {
     if (I->isDeleted())
       continue;
-    // Here we detect redundant assignments like "mov eax, eax" and
-    // suppress them.
-    if (I->isRedundantAssign())
-      continue;
     if (Func->useIntegratedAssembler()) {
       I->emitIAS(Func);
     } else {
       I->emit(Func);
     }
     // Update emitted instruction count, plus fill/spill count for
     // Variable operands without a physical register.
     if (uint32_t Count = I->getEmitInstCount()) {
       Func->getContext()->statsUpdateEmitted(Count);
       if (Variable *Dest = I->getDest()) {
@@ skipping 80 matching lines @@
       if (!First)
         Str << ", ";
       First = false;
       Str << "%" << I->getName();
     }
     Str << "\n";
   }
 }
 
 } // end of namespace Ice