[lworld] Integrated: 8256329: [lworld] C2 compilation fails with assert(!t->is_flat() && !t->is_not_flat()) failed: Should have been optimized out

[Tobias Hartmann]

In rare cases, the flat array check is not processed by IGVN and therefore not optimized out. The fix is to simply add it to the worklist during parsing.

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Commit messages:
 - 8256329: [lworld] C2 compilation fails with assert(>is_flat() && >is_not_flat()) failed: Should have been optimized out

Changes: https://git.openjdk.java.net/valhalla/pull/258/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=258&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8256329
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/258.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/258/head:pull/258

PR: https://git.openjdk.java.net/valhalla/pull/258