RFR: 8302312: Make ParGCRareEvent_lock G1 specific

[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

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Depends on: https://git.openjdk.org/jdk/pull/12511

Commit messages:
 - rename

Changes: https://git.openjdk.org/jdk/pull/12531/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12531&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8302312
  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