[jdk17u-dev] RFR: 8300823: UB: Compile::_phase_optimize_finished is initialized too late

[Goetz Lindenmaier]

I backport this for parity with 17.0.8-oracle.

I resolved the Copyright. Will mark as clean.

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Commit messages:
 - Backport e4252bb91478e9c2f0a5bbdae7cd663838d91b1b

Changes: https://git.openjdk.org/jdk17u-dev/pull/1271/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=1271&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8300823
  Stats: 13 lines in 1 file changed: 6 ins; 6 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/1271.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/1271/head:pull/1271

PR: https://git.openjdk.org/jdk17u-dev/pull/1271