[perl #77134] negated smart-match does not topicalize like ~~

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# New Ticket Created by  Moritz Lenz 
# Please include the string:  [perl #77134]
# in the subject line of all future correspondence about this issue. 
# <URL: http://rt.perl.org/rt3/Ticket/Display.html?id=77134 >


15:49 < moritz_> rakudo: say 'abc' ~~ .say
15:49 <+p6eval> rakudo 4bd478: OUTPUT«abc␤1␤»
15:49 < moritz_> rakudo: say 'abc' !~~ .say
15:49 <+p6eval> rakudo 4bd478: OUTPUT«Any()␤0␤»

Clearly !~~ should set $_ to the value of the LHS just like ~~ does, and 
only call prefix:<!> on the result.

This currently prevents the match-call branch from merging.

Cheers,
Moritz