Revert of Removed support deprecated (//@|/*@) source(URL|MappingURL)=

test/mjsunit/stack-traces.js

Index: test/mjsunit/stack-traces.js
diff --git a/test/mjsunit/stack-traces.js b/test/mjsunit/stack-traces.js
index 76b73b7233f39790cd610e5abcdd9a0cea25c088..b256033b537233752dae87bdb71fadd153322a23 100644
--- a/test/mjsunit/stack-traces.js
+++ b/test/mjsunit/stack-traces.js
@@ -69,7 +69,7 @@
 
 function testNestedEvalWithSourceURL() {
   var x = "FAIL";
-  var innerEval = 'function Inner() { eval(x); }\n//# sourceURL=res://inner-eval';
+  var innerEval = 'function Inner() { eval(x); }\n//@ sourceURL=res://inner-eval';
   eval("function Outer() { eval(innerEval); Inner(); }; Outer();\n//# sourceURL=res://outer-eval");
 }