Scope tree serialization and ScopeIterator cleanup.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index fd5dc4a70455e0201598305361ffe957cf4e60b0..1a42811ad2f9ae73a66fc0f2a180959b07169d96 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -3020,6 +3020,9 @@ class SerializedScopeInfo : public FixedArray {
     return reinterpret_cast<SerializedScopeInfo*>(object);
   }
 
+  // Return the type of this scope.
+  ScopeType Type();
+
   // Does this scope call eval?
   bool CallsEval();
 
@@ -3035,6 +3038,9 @@ class SerializedScopeInfo : public FixedArray {
   // Return if this has context slots besides MIN_CONTEXT_SLOTS;
   bool HasHeapAllocatedLocals();
 
+  // Return if contexts are allocated for this scope.
+  bool HasContext();
+
   // Lookup support for serialized scope info. Returns the
   // the stack slot index for a given slot name if the slot is
   // present; otherwise returns a value < 0. The name must be a symbol