Cache optimized code on shared function info.

src/deoptimizer.h

Index: src/deoptimizer.h
diff --git a/src/deoptimizer.h b/src/deoptimizer.h
index 514de05f267ae4dc42328badd6732a4862fb2364..9ed14f9802a551d09d1beeb8b1156854c615932d 100644
--- a/src/deoptimizer.h
+++ b/src/deoptimizer.h
@@ -466,14 +466,19 @@ class TranslationIterator BASE_EMBEDDED {
 
   int32_t Next();
 
-  bool HasNext() const { return index_ >= 0; }
+  bool HasNext() const { return index_ < buffer_->length(); }
 
-  void Done() { index_ = -1; }
+  void Done() { index_ = buffer_->length(); }
 
   void Skip(int n) {
     for (int i = 0; i < n; i++) Next();
   }
 
+  void Undo() {
+    ASSERT(index_ > 0);
+    index_--;
+  }
+
  private:
   ByteArray* buffer_;
   int index_;
@@ -526,6 +531,9 @@ class Translation BASE_EMBEDDED {
   static const char* StringFor(Opcode opcode);
 #endif
 
+  // A literal id which refers to the JSFunction itself.
+  static const int kSelfLiteralId = -239;
+
  private:
   TranslationBuffer* buffer_;
   int index_;