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

src/IceTargetLowering.cpp

 //===- subzero/src/IceTargetLowering.cpp - Basic lowering implementation --===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 206 matching lines @@
     case Inst::Fcmp:
       lowerFcmp(llvm::cast<InstFcmp>(Inst));
       break;
     case Inst::Icmp:
       lowerIcmp(llvm::cast<InstIcmp>(Inst));
       break;
     case Inst::InsertElement:
       lowerInsertElement(llvm::cast<InstInsertElement>(Inst));
       break;
     case Inst::IntrinsicCall: {
-      InstIntrinsicCall *Call = llvm::cast<InstIntrinsicCall>(Inst);
+      auto *Call = llvm::cast<InstIntrinsicCall>(Inst);
       if (Call->getIntrinsicInfo().ReturnsTwice)
         setCallsReturnsTwice(true);
       lowerIntrinsicCall(Call);
       break;
     }
     case Inst::Load:
       lowerLoad(llvm::cast<InstLoad>(Inst));
       break;
     case Inst::Phi:
       lowerPhi(llvm::cast<InstPhi>(Inst));
@@ skipping 427 matching lines @@
   if (Target == Target_##X)                                                    \
     return TargetHeader##X::create(Ctx);
 #include "llvm/Config/SZTargets.def"
 
   llvm::report_fatal_error("Unsupported target header lowering");
 }
 
 TargetHeaderLowering::~TargetHeaderLowering() = default;
 
 } // end of namespace Ice