harmony-scoping: make assignment to 'const' a late error.

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/v8.h"
 
 #include "src/ast.h"
@@ skipping 82 matching lines @@
   Node* BuildLoadGlobalObject();
   Node* BuildLoadGlobalProxy();
   Node* BuildLoadClosure();
   Node* BuildLoadObjectField(Node* object, int offset);
 
   // Builders for automatic type conversion.
   Node* BuildToBoolean(Node* value);
 
   // Builders for error reporting at runtime.
   Node* BuildThrowReferenceError(Variable* var, BailoutId bailout_id);
+  Node* BuildThrowConstAssignError(BailoutId bailout_id);
 
   // Builders for dynamic hole-checks at runtime.
   Node* BuildHoleCheckSilent(Node* value, Node* for_hole, Node* not_hole);
   Node* BuildHoleCheckThrow(Node* value, Variable* var, Node* not_hole,
                             BailoutId bailout_id);
 
   // Builders for binary operations.
   Node* BuildBinaryOp(Node* left, Node* right, Token::Value op);
 
   // Builder for stack-check guards.
@@ skipping 327 matching lines @@
 
 Scope* AstGraphBuilder::current_scope() const {
   return execution_context_->scope();
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_AST_GRAPH_BUILDER_H_