RFR: 8279523: Parallel: Remove unnecessary PSScavenge::_to_space_top_before_gc

[Albert Mingkun Yang]

On Wed, 5 Jan 2022 16:09:01 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple change of removing an unnecessary field.
> 
> Test: hotspot_gc

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/6968