x64: Generate code for loading from, storing to and calling properties.

src/x64/frames-x64.cc

Index: src/x64/frames-x64.cc
===================================================================
--- src/x64/frames-x64.cc	(revision 2244)
+++ src/x64/frames-x64.cc	(working copy)
@@ -80,8 +80,9 @@
 }
 
 byte* InternalFrame::GetCallerStackPointer() const {
-  UNIMPLEMENTED();
-  return NULL;
+  // Internal frames have no arguments. The stack pointer of the
+  // caller is at a fixed offset from the frame pointer.
+  return fp() + StandardFrameConstants::kCallerSPOffset;
 }
 
 byte* JavaScriptFrame::GetCallerStackPointer() const {