Refactor all instances of `typedef y x` to the C++11 `using x = y` syntax.

src/IceTargetLoweringX86Base.h

 //===- subzero/src/IceTargetLoweringX86Base.h - x86 lowering ----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 211 matching lines @@
   ///   - above, set if not in range
   /// The index into the range is returned.
   Operand *lowerCmpRange(Operand *Comparison, uint64_t Min, uint64_t Max);
   /// Lowering of a cluster of switch cases. If the case is not matched control
   /// will pass to the default label provided. If the default label is nullptr
   /// then control will fall through to the next instruction. DoneCmp should be
   /// true if the flags contain the result of a comparison with the Comparison.
   void lowerCaseCluster(const CaseCluster &Case, Operand *Src0, bool DoneCmp,
                         CfgNode *DefaultLabel = nullptr);
 
-  typedef void (TargetX86Base::*LowerBinOp)(Variable *, Operand *);
+  using LowerBinOp = void (TargetX86Base::*)(Variable *, Operand *);
   void expandAtomicRMWAsCmpxchg(LowerBinOp op_lo, LowerBinOp op_hi,
                                 Variable *Dest, Operand *Ptr, Operand *Val);
 
   void eliminateNextVectorSextInstruction(Variable *SignExtendedResult);
 
   void scalarizeArithmetic(InstArithmetic::OpKind K, Variable *Dest,
                            Operand *Src0, Operand *Src1);
 
   /// Operand legalization helpers.  To deal with address mode
   /// constraints, the helpers will create a new Operand and emit
   /// instructions that guarantee that the Operand kind is one of those
   /// indicated by the LegalMask (a bitmask of allowed kinds).  If the
   /// input Operand is known to already meet the constraints, it may be
   /// simply returned as the result, without creating any new
   /// instructions or operands.
   enum OperandLegalization {
     Legal_None = 0,
     Legal_Reg = 1 << 0, // physical register, not stack location
     Legal_Imm = 1 << 1,
     Legal_Mem = 1 << 2, // includes [eax+4*ecx] as well as [esp+12]
     Legal_All = ~Legal_None
   };
-  typedef uint32_t LegalMask;
+  using LegalMask = uint32_t;
   Operand *legalize(Operand *From, LegalMask Allowed = Legal_All,
                     int32_t RegNum = Variable::NoRegister);
   Variable *legalizeToReg(Operand *From, int32_t RegNum = Variable::NoRegister);
   /// Legalize the first source operand for use in the cmp instruction.
   Operand *legalizeSrc0ForCmp(Operand *Src0, Operand *Src1);
   /// Turn a pointer operand into a memory operand that can be
   /// used by a real load/store operation. Legalizes the operand as well.
   /// This is a nop if the operand is already a legal memory operand.
   typename Traits::X86OperandMem *formMemoryOperand(Operand *Ptr, Type Ty,
                                                     bool DoLegalize = true);
@@ skipping 460 matching lines @@
   }
 
   BoolFolding FoldingInfo;
 };
 } // end of namespace X86Internal
 } // end of namespace Ice
 
 #include "IceTargetLoweringX86BaseImpl.h"
 
 #endif // SUBZERO_SRC_ICETARGETLOWERINGX86BASE_H