[9, 8u40] RFR (XXS): 8066746: MHs.explicitCastArguments does incorrect type checks for VarargsCollector

[Vladimir Ivanov]

John, Paul, thanks for the reviews!

> Looks ok.
>
> Curiously, is there a reason why you chose to use MH.invokeWithArguments rather than MH.invoke/invokeExact?
No particular reason. Just didn't want to want to spend time tuning call 
site for signature polymorphic method.

Best regards,
Vladimir Ivanov