Subzero: Use "auto" per (unwritten) auto coding style.

src/IceInstMIPS32.cpp

 //===- subzero/src/IceInstMips32.cpp - Mips32 instruction implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 //
 /// \file
@@ skipping 116 matching lines @@
   Str << ", ";
   Inst->getSrc(0)->emit(Func);
   Str << ", ";
   Inst->getSrc(1)->emit(Func);
 }
 
 void InstMIPS32Ret::emit(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   assert(getSrcSize() > 0);
-  Variable *RA = llvm::cast<Variable>(getSrc(0));
+  auto *RA = llvm::cast<Variable>(getSrc(0));
   assert(RA->hasReg());
   assert(RA->getRegNum() == RegMIPS32::Reg_RA);
   Ostream &Str = Func->getContext()->getStrEmit();
   Str << "\t"
       << "jr"
       << "\t";
   RA->emit(Func);
 }
 
 void InstMIPS32Ret::emitIAS(const Cfg *Func) const {
@@ skipping 71 matching lines @@
   DestHi->emit(Func);
   Str << ", ";
   Src->emit(Func);
 }
 
 void InstMIPS32Mov::emitSingleDestMultiSource(const Cfg *Func) const {
   if (!BuildDefs::dump())
     return;
   Ostream &Str = Func->getContext()->getStrEmit();
   Variable *Dest = getDest();
-  Variable *SrcLo = llvm::cast<Variable>(getSrc(0));
-  Variable *SrcHi = llvm::cast<Variable>(getSrc(1));
+  auto *SrcLo = llvm::cast<Variable>(getSrc(0));
+  auto *SrcHi = llvm::cast<Variable>(getSrc(1));
 
   assert(SrcHi->hasReg());
   assert(SrcLo->hasReg());
   assert(Dest->hasReg());
   assert(getSrcSize() == 2);
 
   // Str << "\t"
   //    << "vmov" << getPredicate() << "\t";
   Dest->emit(Func);
   Str << ", ";
@@ skipping 27 matching lines @@
       Str << "move";
   }
 
   Str << "\t";
   getDest()->emit(Func);
   Str << ", ";
   getSrc(0)->emit(Func);
 }
 
 } // end of namespace Ice