Fix bug in ParallelMoveResolver::EmitSwap: implement swaps of FPU spill slots.

runtime/vm/constants_x64.h

 // 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 {
@@ skipping 52 matching lines @@
   XMM15 = 15,
   kNumberOfXmmRegisters = 16,
   kNoXmmRegister = -1  // Signals an illegal register.
 };
 
 
 // Architecture independent aliases.
 typedef XmmRegister FpuRegister;
 const FpuRegister FpuTMP = XMM0;
 const int kNumberOfFpuRegisters = kNumberOfXmmRegisters;
+const FpuRegister kNoFpuRegister = kNoXmmRegister;
 
 
 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 82 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_