Enable stub generation using Hydrogen/Lithium (again)

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 30f7e1f00e552575295b074b08d5bb4396461cbb..6a9570eead57305feb5eec5bde7de33b88f38089 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -136,6 +136,7 @@ class StackHandler BASE_EMBEDDED {
   V(EXIT,              ExitFrame)             \
   V(JAVA_SCRIPT,       JavaScriptFrame)       \
   V(OPTIMIZED,         OptimizedFrame)        \
+  V(STUB,              StubFrame)             \
   V(INTERNAL,          InternalFrame)         \
   V(CONSTRUCT,         ConstructFrame)        \
   V(ARGUMENTS_ADAPTOR, ArgumentsAdaptorFrame)
@@ -555,7 +556,33 @@ class JavaScriptFrame: public StandardFrame {
 };
 
 
-class OptimizedFrame : public JavaScriptFrame {
+class CompiledFrame : public JavaScriptFrame {
+ public:
+  virtual Type type() const = 0;
+
+  // GC support.
+  virtual void Iterate(ObjectVisitor* v) const;
+
+ protected:
+  inline explicit CompiledFrame(StackFrameIterator* iterator);
+};
+
+
+class StubFrame : public CompiledFrame {
+ public:
+  virtual Type type() const { return STUB; }
+
+  // GC support.
+  virtual void Iterate(ObjectVisitor* v) const;
+
+ protected:
+  inline explicit StubFrame(StackFrameIterator* iterator);
+
+  friend class StackFrameIterator;
+};
+
+
+class OptimizedFrame : public CompiledFrame {
  public:
   virtual Type type() const { return OPTIMIZED; }