Reland "Add basic crankshaft support for slow-mode for-in to avoid disabling optimizations"

src/hydrogen.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_H_
 #define V8_HYDROGEN_H_
 
 #include "src/v8.h"
 
 #include "src/accessors.h"
@@ skipping 2242 matching lines @@
   void VisitTypeof(UnaryOperation* expr);
   void VisitNot(UnaryOperation* expr);
 
   void VisitComma(BinaryOperation* expr);
   void VisitLogicalExpression(BinaryOperation* expr);
   void VisitArithmeticExpression(BinaryOperation* expr);
 
   void VisitLoopBody(IterationStatement* stmt,
                      HBasicBlock* loop_entry);
 
+  void BuildForInBody(ForInStatement* stmt, Variable* each_var,
+                      HValue* enumerable);
+
   // Create a back edge in the flow graph.  body_exit is the predecessor
   // block and loop_entry is the successor block.  loop_successor is the
   // block where control flow exits the loop normally (e.g., via failure of
   // the condition) and break_block is the block where control flow breaks
   // from the loop.  All blocks except loop_entry can be NULL.  The return
   // value is the new successor block which is the join of loop_successor
   // and break_block, or NULL.
   HBasicBlock* CreateLoop(IterationStatement* statement,
                           HBasicBlock* loop_entry,
                           HBasicBlock* body_exit,
@@ skipping 764 matching lines @@
   }
 
  private:
   HGraphBuilder* builder_;
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_H_