RFR: 8274235: -Xshare:dump should not call vm_direct_exit

[David Holmes]

On Fri, 8 Jul 2022 05:27:04 GMT, Calvin Cheung <ccheung at openjdk.org> wrote:

> Just changing the `vm_direct_exit` calls during CDS dump time to `os::_exit`.
> 
> Passed tiers 1 and 2 tests on Oracle supported platforms.

LGTM2.

Thanks.

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Marked as reviewed by dholmes (Reviewer).

PR: https://git.openjdk.org/jdk/pull/9421