RFR: 8306735: G1: G1FullGCScope remove unnecessary member _explicit_gc

Tue Apr 25 11:13:15 UTC 2023

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

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Commit messages:
 - Remove _explicit_gc

Changes: https://git.openjdk.org/jdk/pull/13638/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13638&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8306735
  Stats: 31 lines in 7 files changed: 0 ins; 20 del; 11 mod
  Patch: https://git.openjdk.org/jdk/pull/13638.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13638/head:pull/13638

PR: https://git.openjdk.org/jdk/pull/13638