[perl #125671] Defining a prefix * operator seriously slows down parse of Perl 6 code

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# New Ticket Created by  Rob Hoelz 
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See the attached file.

When I uncomment the line that defines a * prefix operator (ala pointer 
dereferencing in C), the runtime for the script is five times as long.
class MyThing {
    has $.value;
}

# uncommenting this results in a 5x long compilation time
#sub prefix:<*>(MyThing $thing) { $thing.value }

my $thing = MyThing.new(:value<foo>);
say $thing.value;