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

runtime/vm/stack_frame_x64.cc

Index: runtime/vm/stack_frame_x64.cc
===================================================================
--- runtime/vm/stack_frame_x64.cc	(revision 2143)
+++ runtime/vm/stack_frame_x64.cc	(working copy)
@@ -9,6 +9,11 @@
 
 namespace dart {
 
+// The constant kExitLinkOffsetInEntryFrame must be kept in sync with the
+// code in the InvokeDartCode stub.
+static const int kExitLinkOffsetInEntryFrame = -8 * kWordSize;

[Ivan Posva, 2011/12/07 08:34:51]

Shouldn't this then refer to a constant used in the InvokeDartCode stub.

[regis, 2011/12/07 19:37:36]

Neither stub_code_<arch>.cc nor stack_frame_<arch>.cc have a corresponding
<arch>-dependent header. I could define this constant in constants_<arch>.h and
assert its value in both stub_code_<arch>.cc and stack_frame_<arch>.cc.
Any better idea?

+
+
 intptr_t StackFrame::PcAddressOffsetFromSp() {
   UNIMPLEMENTED();
   return 0;