RFR: 8286303: Serial: Remove reference to ParGCRareEvent_lock [v2]

[Thomas Schatzl]

> Hi all,
> 
>   can I have reviews for this removal of an unused reference of ParGCRareEvent_lock in serial gc code - it is the only user of this BOT code, the other collectors have their own, completely separate one as far as I can tell.
> 
> Testing: gha, tier1-5
> 
> Thanks,
> Thomas

Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase.

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/8576/files
  - new: https://git.openjdk.java.net/jdk/pull/8576/files/d195077b..d195077b

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=8576&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=8576&range=00-01

  Stats: 0 lines in 0 files changed: 0 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/8576.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/8576/head:pull/8576

PR: https://git.openjdk.java.net/jdk/pull/8576