The return value of `convert0('X', vspecies().withLanes(laneType))` is
polymorphic, making the subsequent call `swapIfNeeded` megamorphic and thus
causing allocations. We have the constant species available and should execute
code on the species instead.
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Interim AI Policy](https://openjdk.org/legal/ai).
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Commit messages:
- 8392004
- Try to fix sublane swap inline
Changes: https://git.openjdk.org/jdk/pull/32803/files
Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=32803&range=00
Issue: https://bugs.openjdk.org/browse/JDK-8392004
Stats: 185 lines in 10 files changed: 49 ins; 133 del; 3 mod
Patch: https://git.openjdk.org/jdk/pull/32803.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/32803/head:pull/32803
PR: https://git.openjdk.org/jdk/pull/32803
