Port r9643 to 3.6 branch.

src/parser.cc

Index: src/parser.cc
diff --git a/src/parser.cc b/src/parser.cc
index 5075f49f162d54ee2a9f3bf263523673fb78fcad..f9500c405b837eb8aab67c1e82b7c48e3684676d 100644
--- a/src/parser.cc
+++ b/src/parser.cc
@@ -5198,13 +5198,16 @@ bool ParserApi::Parse(CompilationInfo* info) {
   bool harmony_block_scoping = !info->is_native() &&
                                FLAG_harmony_block_scoping;
   if (info->is_lazy()) {
-    Parser parser(script, true, NULL, NULL);
+    bool allow_natives_syntax =
+        FLAG_allow_natives_syntax ||
+        info->is_native();
+    Parser parser(script, allow_natives_syntax, NULL, NULL);
     parser.SetHarmonyBlockScoping(harmony_block_scoping);
     result = parser.ParseLazy(info);
   } else {
     // Whether we allow %identifier(..) syntax.
     bool allow_natives_syntax =
-        info->allows_natives_syntax() || FLAG_allow_natives_syntax;
+        info->is_native() || FLAG_allow_natives_syntax;
     ScriptDataImpl* pre_data = info->pre_parse_data();
     Parser parser(script,
                   allow_natives_syntax,