RFR: 8266055: ZGC: ZHeap::print_extended_on() doesn't disable deferred delete

[Per Liden]

On Tue, 27 Apr 2021 13:43:09 GMT, Erik Österlund <eosterlund at openjdk.org> wrote:

>> In `ZHeap::print_extended_on()`, the last call to `_page_allocator.enable_deferred_delete()` should be `_page_allocator.disable_deferred_delete()`.
>
> Looks fantastic.

Thanks @fisk and @albertnetymk for reviewing!

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PR: https://git.openjdk.java.net/jdk/pull/3717