RFR: 8273675: Remove unused Universe::_verify_in_progress flag

[Harold Seigel]

On Mon, 13 Sep 2021 20:07:14 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This is a trivial change to remove an unused flag in class Universe.
> Tested with tier1 on Oracle platforms.

Looks good and trivial.
Thanks, Harold

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Marked as reviewed by hseigel (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/5501