[jdk21u-dev] RFR: 8329840: Fix ZPhysicalMemorySegment::_end type

[Liang Mao]

Clean backport of fixing type of ZPhysicalMemorySegment::_end type

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Commit messages:
 - Backport b4ddddeff1ce4293c88a9ab8ad3ca9d3b0e2352e

Changes: https://git.openjdk.org/jdk21u-dev/pull/583/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk21u-dev&pr=583&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8329840
  Stats: 56 lines in 4 files changed: 49 ins; 0 del; 7 mod
  Patch: https://git.openjdk.org/jdk21u-dev/pull/583.diff
  Fetch: git fetch https://git.openjdk.org/jdk21u-dev.git pull/583/head:pull/583

PR: https://git.openjdk.org/jdk21u-dev/pull/583