Integrated: Merge lworld

[Vicente Romero]

Merge lworld into lw5

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Commit messages:
 - Merge branch 'lworld' into merge_with_lworld
 - 8310650: [lworld] Problemlist PrimitiveClassConstantTest.java
 - 8310034: [lworld] C2 compilation fails with assert "array can't be flattened"

The merge commit only contains trivial merges, so no merge-specific webrevs have been generated.

Changes: https://git.openjdk.org/valhalla/pull/879/files
  Stats: 4 lines in 3 files changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/valhalla/pull/879.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/879/head:pull/879

PR: https://git.openjdk.org/valhalla/pull/879