Revert trunk to bleeding_edge at r12484

src/ast.h

Index: src/ast.h
diff --git a/src/ast.h b/src/ast.h
index 802ac65962501dfa47db0f43f4e4de95c984a145..e72296cff74baa0116c0a1d9aa7781f22c999966 100644
--- a/src/ast.h
+++ b/src/ast.h
@@ -1870,6 +1870,15 @@ class Assignment: public Expression {
   // This check relies on the definition order of token in token.h.
   bool is_compound() const { return op() > Token::ASSIGN; }
 
+  // An initialization block is a series of statments of the form
+  // x.y.z.a = ...; x.y.z.b = ...; etc. The parser marks the beginning and
+  // ending of these blocks to allow for optimizations of initialization
+  // blocks.
+  bool starts_initialization_block() { return block_start_; }
+  bool ends_initialization_block() { return block_end_; }
+  void mark_block_start() { block_start_ = true; }
+  void mark_block_end() { block_end_ = true; }
+
   BailoutId AssignmentId() const { return assignment_id_; }
 
   // Type feedback information.
@@ -1902,6 +1911,9 @@ class Assignment: public Expression {
   BinaryOperation* binary_operation_;
   const BailoutId assignment_id_;
 
+  bool block_start_;
+  bool block_end_;
+
   bool is_monomorphic_;
   SmallMapList receiver_types_;
 };