[lworld] RFR: 8328699: [lworld] C2 compilation fails with "no reachable node should have no use"

[Tobias Hartmann]

`InlineTypeNode::set_*` methods should use `set_req_X` instead of `set_req` to make sure that an input node becoming dead is processed by IGVN.

Thanks,
Tobias

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Commit messages:
 - 8328699: [lworld] C2 compilation fails with "no reachable node should have no use"

Changes: https://git.openjdk.org/valhalla/pull/1055/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1055&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8328699
  Stats: 16 lines in 6 files changed: 0 ins; 0 del; 16 mod
  Patch: https://git.openjdk.org/valhalla/pull/1055.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1055/head:pull/1055

PR: https://git.openjdk.org/valhalla/pull/1055