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

src/IceAssemblerX86BaseImpl.h

 //===- subzero/src/IceAssemblerX86BaseImpl.h - base x86 assembler -*- C++ -*-=//
 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 //
 // Modified by the Subzero authors.
 //
 //===----------------------------------------------------------------------===//
 //
 //                        The Subzero Code Generator
@@ skipping 159 matching lines @@
 
 template <class Machine>
 template <typename, typename>
 void AssemblerX86Base<Machine>::popal() {
   AssemblerBuffer::EnsureCapacity ensured(&Buffer);
   emitUint8(0x61);
 }
 
 template <class Machine>
 void AssemblerX86Base<Machine>::setcc(typename Traits::Cond::BrCond condition,
-                                      typename Traits::ByteRegister dst) {
+                                      typename Traits::GPRRegister dst) {
   AssemblerBuffer::EnsureCapacity ensured(&Buffer);
   emitRexB(IceType_i8, dst);
   emitUint8(0x0F);
   emitUint8(0x90 + condition);
   emitUint8(0xC0 + gprEncoding(dst));
 }
 
 template <class Machine>
 void AssemblerX86Base<Machine>::setcc(typename Traits::Cond::BrCond condition,
                                       const typename Traits::Address &address) {
@@ skipping 3245 matching lines @@
   (void)shifter;
   if (Ty == IceType_i16)
     emitOperandSizeOverride();
   emitRexB(Ty, operand.rm());
   emitUint8(isByteSizedArithType(Ty) ? 0xD2 : 0xD3);
   emitOperand(rm, operand);
 }
 
 } // end of namespace X86Internal
 } // end of namespace Ice