[jdk18u] RFR: 8285923: [REDO] JDK-8285802 AArch64: Consistently handle offsets in MacroAssembler as 64-bit quantities

[Tobias Hartmann]

Backport of [JDK-8285923](https://bugs.openjdk.java.net/browse/JDK-8285923). Did not apply cleanly due to changes to surrounding code. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8285923: [REDO] JDK-8285802 AArch64: Consistently handle offsets in MacroAssembler as 64-bit quantities

Changes: https://git.openjdk.org/jdk18u/pull/159/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk18u&pr=159&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8285923
  Stats: 29 lines in 3 files changed: 4 ins; 0 del; 25 mod
  Patch: https://git.openjdk.org/jdk18u/pull/159.diff
  Fetch: git fetch https://git.openjdk.org/jdk18u pull/159/head:pull/159

PR: https://git.openjdk.org/jdk18u/pull/159