Subzero: Refactor x86 register definitions to use the alias mechanism.

src/IceIntrinsics.h

 //===- subzero/src/IceIntrinsics.h - List of Ice Intrinsics -----*- C++ -*-===//
 //
 //                        The Subzero Code Generator
 //
 // This file is distributed under the University of Illinois Open Source
 // License. See LICENSE.TXT for details.
 //
 //===----------------------------------------------------------------------===//
 ///
 /// \file
 /// This file declares the kinds of intrinsics supported by PNaCl.
 ///
 //===----------------------------------------------------------------------===//
 
 #ifndef SUBZERO_SRC_ICEINTRINSICS_H
 #define SUBZERO_SRC_ICEINTRINSICS_H
 
 #include "IceDefs.h"
 #include "IceTypes.h"
 
 namespace Ice {
 
 class InstCall;
 
-static const size_t kMaxIntrinsicParameters = 6;
+static constexpr size_t kMaxIntrinsicParameters = 6;
 
 class Intrinsics {
   Intrinsics(const Intrinsics &) = delete;
   Intrinsics &operator=(const Intrinsics &) = delete;
 
 public:
   Intrinsics();
   ~Intrinsics();
 
   /// Some intrinsics allow overloading by type. This enum collapses all
@@ skipping 128 matching lines @@
 
 private:
   // TODO(jvoung): May want to switch to something like LLVM's StringMap.
   using IntrinsicMap = std::map<IceString, FullIntrinsicInfo>;
   IntrinsicMap Map;
 };
 
 } // end of namespace Ice
 
 #endif // SUBZERO_SRC_ICEINTRINSICS_H