Unify deoptimizer for JavaScript frames.

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 3c44f5e5b4586a323bbec112c41d87b55b063000..f09c24a3fbf43198d75bf07e75cfeed70e6c63e6 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -584,6 +584,10 @@ class JavaScriptFrame: public StandardFrame {
   // Build a list with summaries for this frame including all inlined frames.
   virtual void Summarize(List<FrameSummary>* frames);
 
+  // Architecture-specific register description.
+  static Register fp_register();
+  static Register context_register();
+
   static JavaScriptFrame* cast(StackFrame* frame) {
     ASSERT(frame->is_java_script());
     return static_cast<JavaScriptFrame*>(frame);