RFR: 8329580: Parallel: Remove VerifyObjectStartArray

[Albert Mingkun Yang]

Simple removing a jvm verification flag.

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

Commit messages:
 - pgc-remove-verify-obj-start

Changes: https://git.openjdk.org/jdk/pull/18596/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18596&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329580
  Stats: 48 lines in 6 files changed: 0 ins; 46 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/18596.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18596/head:pull/18596

PR: https://git.openjdk.org/jdk/pull/18596