Implement ES6 rest parameters

src/compiler/ast-graph-builder.h

Index: src/compiler/ast-graph-builder.h
diff --git a/src/compiler/ast-graph-builder.h b/src/compiler/ast-graph-builder.h
index c8a698b219a7d694dd3a3b34e73019272bfdad40..43a2d65c84382dc649ea8818fe26fc86db5e0c1c 100644
--- a/src/compiler/ast-graph-builder.h
+++ b/src/compiler/ast-graph-builder.h
@@ -205,6 +205,9 @@ class AstGraphBuilder : public AstVisitor {
   // Builder to create an arguments object if it is used.
   Node* BuildArgumentsObject(Variable* arguments);
 
+  // Builder to create an array of rest parameters if used
+  Node* BuildRestArgumentsArray(Variable* rest, int index);
+
   // Builders for variable load and assignment.
   Node* BuildVariableAssignment(Variable* var, Node* value, Token::Value op,
                                 BailoutId bailout_id,