Subzero: Remove Variable::NeedsStackSlot.

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 416 matching lines @@
         // the "X=A" assignment in the cycle because it will have to
         // be rewritten as "X=tmp".
         for (size_t J = 0; !Found && J < NumPhis; ++J) {
           if (Desc[J].Processed)
             continue;
           Operand *OtherSrc = Desc[J].Src;
           if (Desc[J].NumPred && sameVarOrReg(Dest, OtherSrc)) {
             SizeT VarNum = Func->getNumVariables();
             Variable *Tmp = Func->makeVariable(
                 OtherSrc->getType(), "__split_" + std::to_string(VarNum));
-            Tmp->setNeedsStackSlot();
             Assignments.push_back(InstAssign::create(Func, Tmp, OtherSrc));
             Desc[J].Src = Tmp;
             Found = true;
           }
         }
         assert(Found);
       }
       // Now that a cycle (if any) has been broken, create the actual
       // assignment.
       Assignments.push_back(InstAssign::create(Func, Dest, Src));
@@ skipping 564 matching lines @@
       if (!First)
         Str << ", ";
       First = false;
       Str << "%" << I->getName();
     }
     Str << "\n";
   }
 }
 
 } // end of namespace Ice