Merge up to bleeding_edge r7201 to isolates branch.

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index bdb29af23fa4a45f286e996ee33947526143ebfe..19d3580c4bf48dca3779864922ae2702ab843a87 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1220,6 +1220,7 @@ class Property: public Expression {
         is_monomorphic_(false),
         is_array_length_(false),
         is_string_length_(false),
+        is_string_access_(false),
         is_function_prototype_(false),
         is_arguments_access_(false) { }
 
@@ -1234,6 +1235,7 @@ class Property: public Expression {
   bool is_synthetic() const { return type_ == SYNTHETIC; }
 
   bool IsStringLength() const { return is_string_length_; }
+  bool IsStringAccess() const { return is_string_access_; }
   bool IsFunctionPrototype() const { return is_function_prototype_; }
 
   // Marks that this is actually an argument rewritten to a keyed property
@@ -1267,6 +1269,7 @@ class Property: public Expression {
   bool is_monomorphic_ : 1;
   bool is_array_length_ : 1;
   bool is_string_length_ : 1;
+  bool is_string_access_ : 1;
   bool is_function_prototype_ : 1;
   bool is_arguments_access_ : 1;
   Handle<Map> monomorphic_receiver_type_;