[perl #113884] Interpolation into regexes does not participate in LTM

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# New Ticket Created by  Moritz Lenz 
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< moritz> r: my $x = 'ab'; say ('ab' ~~ / a | b | $x /).Str
<+p6eval> rakudo 88a9d6: OUTPUT«a␤»
< moritz> just to be sure, that's supposed to LTM, right?
< pmichaud> aiui, yes.
< TimToady> moritz: yes, $x should match since the literal prefix is 
only used as a tiebreaker