[lworld] RFR: 8367415: Fully encapsulate array allocation in oopFactory

[Coleen Phillimore]

This makes oopFactory and deoptimization the only friends of private ArrayKlass::allocate_instance.  This is similar to the PR https://github.com/openjdk/jdk/pull/27372 in mainline with some extra handling for new_refArray (rather than calling RefArrayKlass::allocate_instance() directly.
Tested with tier1-4.

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Commit messages:
 - 8367415: Fully encapsulate array allocation in oopFactory

Changes: https://git.openjdk.org/valhalla/pull/1602/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1602&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8367415
  Stats: 53 lines in 10 files changed: 19 ins; 24 del; 10 mod
  Patch: https://git.openjdk.org/valhalla/pull/1602.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1602/head:pull/1602

PR: https://git.openjdk.org/valhalla/pull/1602