[lworld] RFR: 8368933: [lworld] Unsafe.arrayBaseOffset() ambiguous

[Frederic Parain]

Renaming of Unsafe methods to prevent ambiguity when null is passed in argument.

Tested with Mach5 tier1-3.

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Commit messages:
 - Rename ambiguous Unsafe methods

Changes: https://git.openjdk.org/valhalla/pull/1684/files
  Webrev: https://webrevs.openjdk.org/?repo=valhalla&pr=1684&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8368933
  Stats: 65 lines in 6 files changed: 10 ins; 1 del; 54 mod
  Patch: https://git.openjdk.org/valhalla/pull/1684.diff
  Fetch: git fetch https://git.openjdk.org/valhalla.git pull/1684/head:pull/1684

PR: https://git.openjdk.org/valhalla/pull/1684