[perl #125253] [BUG] USAGE lacks comment when where clause is present

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# New Ticket Created by  Tobias Leich 
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sub MAIN($a) { ... } #= flubber
rakudo-moar c2a57e: OUTPUT«Usage:␤  /tmp/jF9IVKBBk9 <a> -- flubber␤»

sub MAIN($a where True) { ... } #= flubber
rakudo-moar c2a57e: OUTPUT«Usage:␤  /tmp/1Z80c6DhRA <a> ␤»

I expect that both mention 'flubber'.