[lworld] RFR: 8256330: [lworld] Dead inline type nodes are not reclaimed assertions

[Tobias Hartmann]

Fixed missing registration of new nodes with IGVN and re-enabled assert such that code is in sync with mainline.

Thanks,
Tobias

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Commit messages:
 - 8256330: [lworld] Dead inline type nodes are not reclaimed assertions

Changes: https://git.openjdk.java.net/valhalla/pull/296/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=296&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256330
  Stats: 6 lines in 4 files changed: 2 ins; 0 del; 4 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/296.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/296/head:pull/296

PR: https://git.openjdk.java.net/valhalla/pull/296