RFR: 8309044: Replace NULL with nullptr, final sweep of hotspot code

Mon May 29 11:02:27 UTC 2023

A final sweep of Hotspot to remove all re-added NULLs. With only 110 changes I'd appreciate if this was considered trivial.

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

Commit messages:
 - Fix remaining work

Changes: https://git.openjdk.org/jdk/pull/14198/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14198&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309044
  Stats: 110 lines in 63 files changed: 0 ins; 0 del; 110 mod
  Patch: https://git.openjdk.org/jdk/pull/14198.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14198/head:pull/14198

PR: https://git.openjdk.org/jdk/pull/14198