RFR: 8332683: G1 : G1CardSetArray::EntryDataType [2] triggers ubsan runtime errors

[Ivan Walulya]

Hi all,

Please review this change to fix ubsan triggered errors on access to VLA entries in  G1CardSetArray. 

Testing: Tier 1-3
- Local testing on Mac with --enable-ubsan.

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Commit messages:
 - Merge remote-tracking branch 'upstream/master' into JDK-8332683-EntryDataType-ubsan
 - cleanup
 - space
 - init

Changes: https://git.openjdk.org/jdk/pull/19365/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=19365&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8332683
  Stats: 35 lines in 2 files changed: 27 ins; 0 del; 8 mod
  Patch: https://git.openjdk.org/jdk/pull/19365.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19365/head:pull/19365

PR: https://git.openjdk.org/jdk/pull/19365