[esnext] implement frontend changes for async/await proposal

src/ast/ast.cc

Index: src/ast/ast.cc
diff --git a/src/ast/ast.cc b/src/ast/ast.cc
index e8b6269648ed394e27dc2af919c4f9db8e49b6fa..dad81d4ee0e1c30c5738aac2d74adfacdf20b208 100644
--- a/src/ast/ast.cc
+++ b/src/ast/ast.cc
@@ -234,26 +234,24 @@ bool FunctionLiteral::NeedsHomeObject(Expression* expr) {
   return expr->AsFunctionLiteral()->scope()->NeedsHomeObject();
 }
 
-
 ObjectLiteralProperty::ObjectLiteralProperty(Expression* key, Expression* value,
-                                             Kind kind, bool is_static,
+                                             Kind kind, MethodKind method_kind,
                                              bool is_computed_name)
     : key_(key),
       value_(value),
       kind_(kind),
+      method_kind_(method_kind),
       emit_store_(true),
-      is_static_(is_static),
       is_computed_name_(is_computed_name) {}
 
-
 ObjectLiteralProperty::ObjectLiteralProperty(AstValueFactory* ast_value_factory,
                                              Expression* key, Expression* value,
-                                             bool is_static,
+                                             MethodKind method_kind,
                                              bool is_computed_name)
     : key_(key),
       value_(value),
+      method_kind_(method_kind),
       emit_store_(true),
-      is_static_(is_static),
       is_computed_name_(is_computed_name) {
   if (!is_computed_name &&
       key->AsLiteral()->raw_value()->EqualsString(