RFR: 8276047: G1: refactor G1CardSetArrayLocker

[Albert Mingkun Yang]

On Wed, 27 Oct 2021 08:52:08 GMT, Albert Mingkun Yang <ayang at openjdk.org> wrote:

> Simple refactoring in `G1CardSetArrayLocker`:
> 
> 1. rename fields to sth more explicit
> 2. drop `volatile` for thread-local variables
> 3. increment directly without treating `bool` as an integer
> 
> Test: hotspot_gc

Thanks for the review.

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PR: https://git.openjdk.java.net/jdk/pull/6134