RFR: 8371187: [BigEndian Platforms] Vector lane reversal error [v3]

[Varada M]

> This change fixes incorrect lane ordering in reinterpretation operations on big-endian platforms. When converting from wider to narrower lane types like Long to Int, Long to Short, big-endian systems produced reversed sub-lanes.
> The patch adds a maybeSwapOnConverted() and a generic normalizeSubLanesForSpecies() shuffle builder to correct the sub-lane order based on element sizes on big-endian
> 
> JBS: [JDK-8371187](https://bugs.openjdk.org/browse/JDK-8371187)

Varada M has refreshed the contents of this pull request, and previous commits have been removed. The incremental views will show differences compared to the previous content of the PR. The pull request contains two new commits since the last revision:

 - 8371187: [BigEndian Platforms] Vector lane reversal error
 - fix for vector alignment issue on big-endian

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/28425/files
  - new: https://git.openjdk.org/jdk/pull/28425/files/7c87d2bc..670043ae

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=28425&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=28425&range=01-02

  Stats: 2 lines in 2 files changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/28425.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/28425/head:pull/28425

PR: https://git.openjdk.org/jdk/pull/28425