Fix vm code base so that it can be built for --arch=simarm (no snapshot yet).

runtime/vm/constants_x64.h

-// Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
+// 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.
 
 #ifndef VM_CONSTANTS_X64_H_
 #define VM_CONSTANTS_X64_H_
 
 namespace dart {
 
 enum Register {
   RAX = 0,
@@ skipping 45 matching lines @@
   XMM11 = 11,
   XMM12 = 12,
   XMM13 = 13,
   XMM14 = 14,
   XMM15 = 15,
   kNumberOfXmmRegisters = 16,
   kNoXmmRegister = -1  // Signals an illegal register.
 };
 
 
+// Architecture independent aliases.
+typedef XmmRegister FpuRegister;
+const FpuRegister FpuTMP = XMM0;
+const int kNumberOfFpuRegisters = kNumberOfXmmRegisters;
+
+
 enum RexBits {
   REX_NONE   = 0,
   REX_B      = 1 << 0,
   REX_X      = 1 << 1,
   REX_R      = 1 << 2,
   REX_W      = 1 << 3,
   REX_PREFIX = 1 << 6
 };
 
 
@@ skipping 72 matching lines @@
 };
 
 
 // The largest multibyte nop we will emit.  This could go up to 15 if it
 // becomes important to us.
 const int MAX_NOP_SIZE = 8;
 
 }  // namespace dart
 
 #endif  // VM_CONSTANTS_X64_H_