Implement ES6 rest parameters

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index 31439039de15f1506e13b117c2a56dd0b6109ac4..f6a51a0292f9e09dfda1943c29c1516b2c6388fa 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -5960,6 +5960,11 @@ bool SharedFunctionInfo::is_compiled() {
 }
 
 
+bool SharedFunctionInfo::is_simple_parameter_list() {
+  return scope_info()->IsSimpleParameterList();
+}
+
+
 bool SharedFunctionInfo::IsApiFunction() {
   return function_data()->IsFunctionTemplateInfo();
 }
@@ -6233,6 +6238,11 @@ bool JSFunction::is_compiled() {
 }
 
 
+bool JSFunction::is_simple_parameter_list() {
+  return shared()->is_simple_parameter_list();
+}
+
+
 FixedArray* JSFunction::literals() {
   DCHECK(!shared()->bound());
   return literals_or_bindings();