RFR: 8306735: G1: G1FullGCScope remove unnecessary member _explicit_gc

[Albert Mingkun Yang]

On Tue, 25 Apr 2023 11:05:21 GMT, Ivan Walulya <iwalulya at openjdk.org> wrote:

> Hi All,
> 
> Please review this change to remove the unnecessary `explicit_gc` member from G1FullGCScope. We can rely on gc_cause() to determine whether the explicit_gc is true where required. 
> 
> Testing: tier1_gc

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/13638#pullrequestreview-1399685194