RFR: 8303244: G1: call CardTable::clear_MemRegion directly

Mon Feb 27 13:16:27 UTC 2023

Simple refactoring to skip a guard in card-table clearing.

Test: hotspot_gc

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Commit messages:
 - g1-clear-memregion

Changes: https://git.openjdk.org/jdk/pull/12764/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12764&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303244
  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/12764.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12764/head:pull/12764

PR: https://git.openjdk.org/jdk/pull/12764