RFR: 8299973: Replace NULL with nullptr in share/utilities/ [v3]

[Johan Sjölen]

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

Johan Sjölen has updated the pull request incrementally with one additional commit since the last revision:

  Fix incorrect copyrights, reverts change in file that was only comment

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Changes:
  - all: https://git.openjdk.org/jdk/pull/12015/files
  - new: https://git.openjdk.org/jdk/pull/12015/files/d982fae8..992a8f6f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=12015&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=12015&range=01-02

  Stats: 6 lines in 5 files changed: 0 ins; 0 del; 6 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