[lworld] RFR: 8284164: [lworld] Inline type elements of autobox cache should be casted to non-null

[Tobias Hartmann]

The problematic logic in `TypeAryPtr::compute_klass` was removed with the integration of [JDK-8297933](https://bugs.openjdk.org/browse/JDK-8297933):

https://github.com/openjdk/valhalla/blob/8ac816b8642b1994a21b5b1476aca93ba4a1096a/src/hotspot/share/opto/type.cpp#L6047-L6050

We therefore no longer need the workaround.

Best regards,
Tobias

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Commit messages:
 - 8284164: [lworld] Inline type elements of autobox cache should be casted to non-null

Changes: https://git.openjdk.org/valhalla/pull/826/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=826&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8284164
  Stats: 6 lines in 1 file changed: 0 ins; 4 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/826.diff
  Fetch: git fetch https://git.openjdk.org/valhalla pull/826/head:pull/826

PR: https://git.openjdk.org/valhalla/pull/826