RFR: 8288754: GCC 12 fails to build zReferenceProcessor.cpp [v2]

[Aleksey Shipilev]

> When compiling with GCC 12.1.1 (current in Fedora rawhide), the following warning-as-error is produced and breaks the build by default:

Aleksey Shipilev has updated the pull request incrementally with one additional commit since the last revision:

  Unknown

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Changes:
  - all: https://git.openjdk.org/jdk19/pull/47/files
  - new: https://git.openjdk.org/jdk19/pull/47/files/8312ecc1..1b603dfd

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk19&pr=47&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk19&pr=47&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.org/jdk19/pull/47.diff
  Fetch: git fetch https://git.openjdk.org/jdk19 pull/47/head:pull/47

PR: https://git.openjdk.org/jdk19/pull/47