Re-land Crankshaft-generated KeyedLoad stubs.

src/frames.h

Index: src/frames.h
diff --git a/src/frames.h b/src/frames.h
index 9814f84e552fa8ce666c6ca06b7bdbde5e9f59cd..a1d24ac3a075c430bf286f6aa8bc84fae8c31c48 100644
--- a/src/frames.h
+++ b/src/frames.h
@@ -264,12 +264,12 @@ class StackFrame BASE_EMBEDDED {
                      PrintMode mode,
                      int index) const { }
 
+  Isolate* isolate() const { return isolate_; }
+
  protected:
   inline explicit StackFrame(StackFrameIterator* iterator);
   virtual ~StackFrame() { }
 
-  Isolate* isolate() const { return isolate_; }
-
   // Compute the stack pointer for the calling frame.
   virtual Address GetCallerStackPointer() const = 0;
 
@@ -449,6 +449,9 @@ class StandardFrame: public StackFrame {
   // construct frame.
   static inline bool IsConstructFrame(Address fp);
 
+  // Used by OptimizedFrames and StubFrames.
+  void IterateCompiledFrame(ObjectVisitor* v) const;
+
  private:
   friend class StackFrame;
   friend class StackFrameIterator;
@@ -559,33 +562,28 @@ class JavaScriptFrame: public StandardFrame {
 };
 
 
-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 {
+class StubFrame : public StandardFrame {
  public:
   virtual Type type() const { return STUB; }
 
   // GC support.
   virtual void Iterate(ObjectVisitor* v) const;
 
+  // Determine the code for the frame.
+  virtual Code* unchecked_code() const;
+
  protected:
   inline explicit StubFrame(StackFrameIterator* iterator);
 
+  virtual Address GetCallerStackPointer() const;
+
+  virtual int GetNumberOfIncomingArguments() const;
+
   friend class StackFrameIterator;
 };
 
 
-class OptimizedFrame : public CompiledFrame {
+class OptimizedFrame : public JavaScriptFrame {
  public:
   virtual Type type() const { return OPTIMIZED; }