[lworld] RFR: 8369835: [lworld] Intrinsify new instance-accepting array unsafe operations

[Tobias Hartmann]

Intrinsics in C2 as requested by @liach.

Thanks,
Tobias

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Commit messages:
 - 8369835: [lworld] Intrinsify new instance-accepting array unsafe operations

Changes: https://git.openjdk.org/valhalla/pull/1730/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1730&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8369835
  Stats: 198 lines in 7 files changed: 198 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/valhalla/pull/1730.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1730/head:pull/1730

PR: https://git.openjdk.org/valhalla/pull/1730