RFR(S): 8150957: j.l.i.MethodHandles.whileLoop(...) fails with IOOBE in the case 'init' is null, 'step' and 'pred' have parameters

[Michael Haupt]

Dear all,

please review this change.
Bug: https://bugs.openjdk.java.net/browse/JDK-8150957
Webrev: http://cr.openjdk.java.net/~mhaupt/8150957/webrev.00/

The bug was actually fixed with the push for JDK-8150635. This change adds a test for the issue.

Thanks,

Michael

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