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

src/IceAssemblerX86Base.h

 //===- subzero/src/IceAssemblerX86Base.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.
 //
 //===----------------------------------------------------------------------===//
 //
@@ skipping 97 matching lines @@
   llvm::SmallVector<intptr_t, 20> UnresolvedNearPositions;
 
   template <class> friend class AssemblerX86Base;
 };
 
 template <class Machine> class AssemblerX86Base : public Assembler {
   AssemblerX86Base(const AssemblerX86Base &) = delete;
   AssemblerX86Base &operator=(const AssemblerX86Base &) = delete;
 
 protected:
-  AssemblerX86Base(AssemblerKind Kind, GlobalContext *Ctx,
-                   bool use_far_branches)
-      : Assembler(Kind, Ctx) {
+  AssemblerX86Base(AssemblerKind Kind, bool use_far_branches)
+      : Assembler(Kind) {
     // This mode is only needed and implemented for MIPS and ARM.
     assert(!use_far_branches);
     (void)use_far_branches;
   }
 
 public:
   using Traits = MachineTraits<Machine>;
 
   ~AssemblerX86Base() override;
 
@@ skipping 935 matching lines @@
   emitUint8(0x66);
 }
 
 } // end of namespace X86Internal
 
 } // end of namespace Ice
 
 #include "IceAssemblerX86BaseImpl.h"
 
 #endif // SUBZERO_SRC_ICEASSEMBLERX86BASE_H