RFR: 8302312: Make ParGCRareEvent_lock G1 specific [v3]

[Thomas Schatzl]

> Hi all,
> 
> please have a look at this renaming of ParGCRareEvent_lock to G1RareEvent_lock to align with it only being used in G1. Previously it had been used with CMS too, but that one's gone now.
> 
> Testing: local compilation, gha
> 
> Based on PR#12511
> 
> Thanks,
> Thomas

Thomas Schatzl has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains six commits:

 - Merge branch 'master' into 8302312-pargcrarevent-lock
 - rename
 - Improve G1MaxVerifyFailures bounds
 - kbarrett review, indentation
 - Fix compile error with G1MaxVerifyFailures
 - initial attempts, nothing done
   
   further cleanup
   
   more cleanup
   
   factor out changes that move the verifylivenessclosure
   
   fix compilation

-------------

Changes: https://git.openjdk.org/jdk/pull/12531/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12531&range=02
  Stats: 9 lines in 6 files changed: 2 ins; 2 del; 5 mod
  Patch: https://git.openjdk.org/jdk/pull/12531.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12531/head:pull/12531

PR: https://git.openjdk.org/jdk/pull/12531