RFR: 8299973: Replace NULL with nullptr in share/utilities/

[Johan Sjölen]

Do the conversion in the share/utilities sub-directory and all of its files.

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Commit messages:
 - More manual fixes
 - Missed manual fix
 - Merge remote-tracking branch 'origin/master' into JDK-8299837
 - Manual fixes
 -  Replace NULL with nullptr in share/utilities

Changes: https://git.openjdk.org/jdk/pull/12015/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=12015&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299973
  Stats: 574 lines in 59 files changed: 1 ins; 0 del; 573 mod
  Patch: https://git.openjdk.org/jdk/pull/12015.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/12015/head:pull/12015

PR: https://git.openjdk.org/jdk/pull/12015