[turbofan] First step towards sanitizing for-in and making it optimizable.

src/compiler/ast-graph-builder.h

 // Copyright 2014 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_COMPILER_AST_GRAPH_BUILDER_H_
 #define V8_COMPILER_AST_GRAPH_BUILDER_H_
 
 #include "src/ast.h"
 #include "src/compiler/js-graph.h"
 #include "src/compiler/liveness-analyzer.h"
@@ skipping 270 matching lines @@
   Node* BuildLoadGlobalObject();
   Node* BuildLoadGlobalProxy();
   Node* BuildLoadClosure();
   Node* BuildLoadObjectField(Node* object, int offset);
 
   // Builders for accessing external references.
   Node* BuildLoadExternal(ExternalReference ref, MachineType type);
   Node* BuildStoreExternal(ExternalReference ref, MachineType type, Node* val);
 
   // Builders for automatic type conversion.
-  Node* BuildToBoolean(Node* value);
-  Node* BuildToName(Node* value, BailoutId bailout_id);
+  Node* BuildToBoolean(Node* input);
+  Node* BuildToName(Node* input, BailoutId bailout_id);
+  Node* BuildToObject(Node* input, BailoutId bailout_id);
 
   // Builder for adding the [[HomeObject]] to a value if the value came from a
   // function literal and needs a home object. Do nothing otherwise.
   Node* BuildSetHomeObject(Node* value, Node* home_object, Expression* expr);
 
   // Builders for error reporting at runtime.
   Node* BuildThrowError(Node* exception, BailoutId bailout_id);
   Node* BuildThrowReferenceError(Variable* var, BailoutId bailout_id);
   Node* BuildThrowConstAssignError(BailoutId bailout_id);
   Node* BuildThrowStaticPrototypeError(BailoutId bailout_id);
@@ skipping 49 matching lines @@
   void VisitNot(UnaryOperation* expr);
 
   // Dispatched from VisitBinaryOperation.
   void VisitComma(BinaryOperation* expr);
   void VisitLogicalExpression(BinaryOperation* expr);
   void VisitArithmeticExpression(BinaryOperation* expr);
 
   // Dispatched from VisitForInStatement.
   void VisitForInAssignment(Expression* expr, Node* value,
                             BailoutId bailout_id);
-  void VisitForInBody(ForInStatement* stmt);
 
   // Dispatched from VisitClassLiteral.
   void VisitClassLiteralContents(ClassLiteral* expr);
 
   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
   DISALLOW_COPY_AND_ASSIGN(AstGraphBuilder);
 };
 
 
 // The abstract execution environment for generated code consists of
@@ skipping 133 matching lines @@
 
   // Prepare environment to be used as loop header.
   void PrepareForLoop(BitVector* assigned, bool is_osr = false);
 };
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_