[lworld] RFR: 8272448: [lworld] C2 compilation fails with "Bad graph detected in build_loop_late"

[Tobias Hartmann]

The assert does not reproduce anymore after merging with mainline and has most likely been resolved by one of the upstream fixes. I'm re-enabling the optimization.

Best regards,
Tobias

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Commit messages:
 - 8272448: [lworld] C2 compilation fails with "Bad graph detected in build_loop_late"

Changes: https://git.openjdk.java.net/valhalla/pull/567/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=567&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8272448
  Stats: 2 lines in 1 file changed: 0 ins; 1 del; 1 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/567.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/567/head:pull/567

PR: https://git.openjdk.java.net/valhalla/pull/567