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

src/IceInst.h

 //===- subzero/src/IceInst.h - High-level instructions ----------*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
@@ skipping 197 matching lines @@
 
   /// LiveRangesEnded marks which Variables' live ranges end in this
   /// instruction.  An instruction can have an arbitrary number of
   /// source operands (e.g. a call instruction), and each source
   /// operand can contain 0 or 1 Variable (and target-specific operands
   /// could contain more than 1 Variable).  All the variables in an
   /// instruction are conceptually flattened and each variable is
   /// mapped to one bit position of the LiveRangesEnded bit vector.
   /// Only the first CHAR_BIT * sizeof(LREndedBits) variables are
   /// tracked this way.
-  typedef uint32_t LREndedBits; // only first 32 src operands tracked, sorry
+  using LREndedBits = uint32_t; // only first 32 src operands tracked, sorry
   LREndedBits LiveRangesEnded;
 };
 
 class InstHighLevel : public Inst {
   InstHighLevel() = delete;
   InstHighLevel(const InstHighLevel &) = delete;
   InstHighLevel &operator=(const InstHighLevel &) = delete;
 
 protected:
   InstHighLevel(Cfg *Func, InstKind Kind, SizeT MaxSrcs, Variable *Dest)
@@ skipping 752 matching lines @@
   static void noteHead(Ice::Inst *, Ice::Inst *) {}
   void deleteNode(Ice::Inst *) {}
 
 private:
   mutable ilist_half_node<Ice::Inst> Sentinel;
 };
 
 } // end of namespace llvm
 
 #endif // SUBZERO_SRC_ICEINST_H