JEP-271. VM changes contributed by brutisso, test changes contributed by david.
Co-authored-by: David Lindholm <david.lindholm@oralce.com>
Reviewed-by: sjohanss, david, brutisso
The auto corrector for mistyped vm options fuzzy-matches existing flags based on string similarity (Dice's coefficient).
Reviewed-by: kvn, dsamersoff, hseigel, johnc