RFR: 8269433: Remove effectively unused ReferenceProcessor::_enqueuing_is_done

[Albert Mingkun Yang]

On Sun, 27 Jun 2021 14:28:30 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of removing effectively dead code.

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/4605