[jdk20u] RFR: 8303508: Vector.lane() gets wrong value on x86

[Tobias Hartmann]

Backport of [JDK-8303508](https://bugs.openjdk.java.net/browse/JDK-8303508). Applies cleanly. Approval is pending.

Thanks,
Tobias

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Commit messages:
 - 8303508: Vector.lane() gets wrong value on x86

Changes: https://git.openjdk.org/jdk20u/pull/43/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk20u&pr=43&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8303508
  Stats: 91 lines in 3 files changed: 87 ins; 3 del; 1 mod
  Patch: https://git.openjdk.org/jdk20u/pull/43.diff
  Fetch: git fetch https://git.openjdk.org/jdk20u.git pull/43/head:pull/43

PR: https://git.openjdk.org/jdk20u/pull/43