[lworld] RFR: 8252109: [lworld] C2 compilation fails with assert(\!has_phi_inputs(region)) failed: already cloned with phis

[Tobias Hartmann]

Assert is too strong because during a PhiNode::Ideal transformation, some inputs of an InlineTypeNode might already be
PhiNodes  of the same region.

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Commit messages:
 - 8252109: [lworld] C2 compilation fails with assert(\!has_phi_inputs(region)) failed: already cloned with phis

Changes: https://git.openjdk.java.net/valhalla/pull/161/files
 Webrev: https://webrevs.openjdk.java.net/valhalla/161/webrev.00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8252109
  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/161.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/161/head:pull/161

PR: https://git.openjdk.java.net/valhalla/pull/161