Objective-J: fix catastrophic backtracking in comment regex (#2225)

This use of *? was both incorrect and catastrophically backtracking
when embedding this regex into a larger regex with a trailing pattern,
since it could match much more than intended and try exponentially
many positions in that process.

pygments/lexers/javascript.py

@@ -801,7 +801,7 @@ class ObjectiveJLexer(RegexLexer):
     mimetypes = ['text/x-objective-j']
 
     #: optional Comment or Whitespace
-    _ws = r'(?:\s|//.*?\n|/[*].*?[*]/)*'
+    _ws = r'(?:\s|//[^\n]*\n|/[*](?:[^*]|[*][^/])*[*]/)*'
 
     flags = re.DOTALL | re.MULTILINE