Fix sourceURL & sourceMapURL handling in case of background parsing

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index 4ab786dd0c1d86d7dc54b962f976a442a4d3b009..fb59adff572ae2da01eed1179ba8a8040ca5163a 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -1780,6 +1780,7 @@ Local<Script> ScriptCompiler::Compile(Isolate* v8_isolate,
     // Do the parsing tasks which need to be done on the main thread. This will
     // also handle parse errors.
     source->parser->Internalize();
+    source->parser->HandleSourceURLComments();
 
     i::Handle<i::SharedFunctionInfo> result =
         i::Handle<i::SharedFunctionInfo>::null();