Add support for //# sourceURL similar to deprecated //@ sourceURL one.

test/mjsunit/debug-set-script-source.js

Index: test/mjsunit/debug-set-script-source.js
diff --git a/test/mjsunit/debug-set-script-source.js b/test/mjsunit/debug-set-script-source.js
index 34ae8488a4de608543c543555e11236e1c65726e..10ab43cd63d4b3388f293e53e6b502bd952f5464 100644
--- a/test/mjsunit/debug-set-script-source.js
+++ b/test/mjsunit/debug-set-script-source.js
@@ -36,10 +36,10 @@ var exception = null;
 function listener(event, exec_state, event_data, data) {
   if (event == Debug.DebugEvent.BeforeCompile) {
     event_data.script().setSource(event_data.script().source() +
-        " //@ sourceURL=proper_location_" + (++script_number));
+        " //# sourceURL=proper_location_" + (++script_number));
   } else if (event == Debug.DebugEvent.AfterCompile) {
     try {
-      event_data.script().setSource("a=1 //@ sourceURL=wrong_location");
+      event_data.script().setSource("a=1 //# sourceURL=wrong_location");
     } catch(e) {
       exception = e;
     }