[es6] support rest parameters in arrow functions (alternative)

src/compiler/ast-graph-builder.cc

 // 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.
 
 #include "src/compiler/ast-graph-builder.h"
 
 #include "src/compiler.h"
 #include "src/compiler/ast-loop-assignment-analyzer.h"
 #include "src/compiler/control-builders.h"
 #include "src/compiler/linkage.h"
@@ skipping 2292 matching lines @@
   VisitForValue(expr->left());
   VisitForValue(expr->right());
   Node* right = environment()->Pop();
   Node* left = environment()->Pop();
   Node* value = NewNode(op, left, right);
   PrepareFrameState(value, expr->id(), ast_context()->GetStateCombine());
   ast_context()->ProduceValue(value);
 }
 
 
+void AstGraphBuilder::VisitSpread(Spread* expr) {
+  UNREACHABLE();
+}
+
+
 void AstGraphBuilder::VisitThisFunction(ThisFunction* expr) {
   Node* value = GetFunctionClosure();
   ast_context()->ProduceValue(value);
 }
 
 
 void AstGraphBuilder::VisitSuperReference(SuperReference* expr) {
   // TODO(turbofan): Implement super here.
   SetStackOverflow();
   ast_context()->ProduceValue(jsgraph()->UndefinedConstant());
@@ skipping 1014 matching lines @@
     // Phi does not exist yet, introduce one.
     value = NewPhi(inputs, value, control);
     value->ReplaceInput(inputs - 1, other);
   }
   return value;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8