[perl #123511] Parametric role used a second time will use old default values (MoarVM only)

[Brian S. Julin]

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(01:15:28 PM) skids: r: role A [ :$a = 1, :$b = $a * 2] { method foo { say "$a 
$b" } }; role B does A[:a(1)] { }; role C does A[:a(2)] { }; B.new.foo; 
C.new.foo;
(01:15:31 PM) camelia: rakudo-parrot ce1e74: OUTPUT«1 2␤2 4␤»
(01:15:31 PM) camelia: ..rakudo-moar ce1e74: OUTPUT«1 2␤2 2␤»
(01:15:45 PM) skids: r-p++

rakudo-perl's results are correct, rakudo-moarvm is failing to recalculate
the new default value based on the new provided role parameter.