[perl #125344] Int..Whatever ranges are slow (~20 times slower than Int..Int)

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# New Ticket Created by  Rob Hoelz 
# Please include the string:  [perl #125344]
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Let's say I have an array where @array.end == $end.  Using @array[0..$end] is 
about 20 times faster than @array[0..*].  I have attached an example script 
that demonstrates this.

bench.p6
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