RFR: 8350463: AArch64: Add vector rearrange support for small lane count vectors [v4]

[Xiaohong Gong]

On Tue, 18 Mar 2025 07:50:51 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

>> Yes, I think we'd better use a larger warmup to make sure the vector api intrinsics are inlined in C2, so that the IR check can pass.
>
> Did you try without? The default warmup should be sufficient I think. But I could be wrong.

Yes, actually it can pass without this sometimes. I'm afriad the IR test would fail in future, as I met the random failure issue before on other IR tests. I also checked some existing tests under vectorapi, almost all have either 5000 or 10000 warmup.

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PR Review Comment: https://git.openjdk.org/jdk/pull/23790#discussion_r2000419336