[lworld] RFR: 8364464: [lworld] GCs do not process flat arrays by chunks

[Ivan Walulya]

Hi,

Please review this change to add Array Chunking for flatArrays with oops across the G1, Parallel, and Serial GCs

This update addresses the regression reported in [JDK-8373029](https://bugs.openjdk.org/browse/JDK-8373029).

Results after the change:


jdk/bin/java BigArray 80000000

real    0m35.790s
user    5m38.042s
sys     0m1.666s



jdk/bin/java --enable-preview BigArray 80000000

real    0m18.865s
user    2m57.155s
sys     0m1.799s


Test: Tier 1-2 with` --enable-preview`

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

Commit messages:
 - space
 - Serial-GC changes
 - Parallel Changes
 - G1 Changes
 - FlatArrayOop::oop_iterate_elements_range

Changes: https://git.openjdk.org/valhalla/pull/2142/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=2142&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8364464
  Stats: 165 lines in 19 files changed: 95 ins; 27 del; 43 mod
  Patch: https://git.openjdk.org/valhalla/pull/2142.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/2142/head:pull/2142

PR: https://git.openjdk.org/valhalla/pull/2142