[perl #125524] exponentiation overflows to 0 under MoarVM

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# New Ticket Created by  Brad Gilbert 
# Please include the string:  [perl #125524]
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# <URL: https://rt.perl.org/Ticket/Display.html?id=125524 >



    $ perl6-m -e 'say 10 ** 10 ** 10'
    0

While it does come to the conclusion very quickly, the result doesn't make any 
sense.

The JVM backend at least returns a sensible value, even if it does take
quite a bit longer to figure out.

    $ perl6-j -e 'say 10 ** 10 ** 10'
    Inf