ENH Minor performance enhancement for backtrace.

Don't keep processing when we've found a match.

src/Dev/Backtrace.php

@@ -86,6 +86,7 @@ class Backtrace
                         $frame['function'] == $fnSpec[1]
                     ) {
                         $match = true;
+                        break;
                     }
                 }
             } else {