[lworld] RFR: 8367245: [lworld] C2 compilation fails with "Missed optimization opportunity in PhaseIterGVN"

[Marc Chevalier]

Let's just disable the verification for now. The issue will be fixed in mainline, then reach Valhalla.

I've changed the 3 files in which I've observed some clashing speculative types at least once.

This will be reverted by https://bugs.openjdk.org/browse/JDK-8371726 once https://bugs.openjdk.org/browse/JDK-8371716 is solved.

Thanks,
Marc

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Commit messages:
 - Disable tests

Changes: https://git.openjdk.org/valhalla/pull/1732/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1732&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367245
  Stats: 28 lines in 4 files changed: 0 ins; 0 del; 28 mod
  Patch: https://git.openjdk.org/valhalla/pull/1732.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1732/head:pull/1732

PR: https://git.openjdk.org/valhalla/pull/1732