Add 64-bit stubs to call into the runtime and to call native functions.

runtime/vm/stack_frame_x64.cc

 // Copyright (c) 2011, 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.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/stack_frame.h"
 
 namespace dart {
 
+// The constant kExitLinkOffsetInEntryFrame must be kept in sync with the
+// code in the InvokeDartCode stub.
+static const int kExitLinkOffsetInEntryFrame = -8 * kWordSize;
+
+
 intptr_t StackFrame::PcAddressOffsetFromSp() {
   UNIMPLEMENTED();
   return 0;
 }
 
 
 uword StackFrame::GetCallerFp() const {
   UNIMPLEMENTED();
   return 0;
 }
@@ skipping 16 matching lines @@
 }
 
 
 void StackFrameIterator::SetupNextExitFrameData() {
   UNIMPLEMENTED();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64