[lworld] RFR: 8314923: [lworld] AllocationMergesTests.java fails IR verification

[Tobias Hartmann]

The test fails due to [JDK-8314999](https://bugs.openjdk.org/browse/JDK-8314999) which will be fixed in mainline (see bug comments for details). I'll put a stop-the-gap-solution in Valhalla. Missing Valhalla support for [JDK-8287061](https://bugs.openjdk.org/browse/JDK-8287061) (if any), will be implemented by [JDK-8315003](https://bugs.openjdk.org/browse/JDK-8315003).

Thanks,
Tobias

-------------

Commit messages:
 - Missing alloc array
 - 8314923: [lworld] AllocationMergesTests.java fails IR verification

Changes: https://git.openjdk.org/valhalla/pull/919/files
 Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=919&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314923
  Stats: 5 lines in 2 files changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/valhalla/pull/919.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/919/head:pull/919

PR: https://git.openjdk.org/valhalla/pull/919