[lworld] RFR: 8336313: [lworld] C2 compilation hits asserts with -XX:VerifyIterativeGVN=11

[Tobias Hartmann]

Verification code does not like that the hook node we use in `InlineTypeNode::initialize_fields` is dead and that the CmpNode it's attached to is not enqueued for IGVN after replacement. Fixes are straight forward. I'll add `-XX:VerifyIterativeGVN=11` to our (internal) stress job.

Best regards,
Tobias

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Commit messages:
 - 8336313: [lworld] C2 compilation hits asserts with -XX:VerifyIterativeGVN=11

Changes: https://git.openjdk.org/valhalla/pull/1200/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1200&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8336313
  Stats: 2 lines in 1 file changed: 2 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1200.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1200/head:pull/1200

PR: https://git.openjdk.org/valhalla/pull/1200