RFR: 8293209: Parallel: Remove unused variables in PSParallelCompact::invoke

[Albert Mingkun Yang]

On Thu, 1 Sep 2022 11:06:58 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Trivial change of removing dead code.
> 
> Test: build

Thanks for the review.

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PR: https://git.openjdk.org/jdk/pull/10118