Do not use js builtins object to determine whether a function is a builtin.

src/compiler.cc

Index: src/compiler.cc
diff --git a/src/compiler.cc b/src/compiler.cc
index c39936cc254b531c891beb50a23cb7afdfda9333..9e0ef5f13288b88a334484580b068ce56ac5f624 100644
--- a/src/compiler.cc
+++ b/src/compiler.cc
@@ -1352,6 +1352,7 @@ Handle<SharedFunctionInfo> Compiler::CompileScript(
     Handle<Script> script = isolate->factory()->NewScript(source);
     if (natives == NATIVES_CODE) {
       script->set_type(Smi::FromInt(Script::TYPE_NATIVE));
+      script->set_hide_source(true);
     }
     if (!script_name.is_null()) {
       script->set_name(*script_name);