[lworld+vector] RFR: 8311610: [lworld+vector] Clean-up of vector allocation in class VectorSupport [v4]

[Xiaohong Gong]

On Wed, 12 Jul 2023 08:14:21 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

>> Or, is the vector supported for 1 lanecount (e.g. 64-bit shape for `long/double` type) on x86 systems?
>
>> Or, is the vector supported for 1 lanecount (e.g. 64-bit shape for `long/double` type) on x86 systems?
> 
> Not yes, most of the vector intrinsic also fail for single lane vector operations.

Yeah, I also met the bad ad file crashes due to single lane for double type on x86 system. And I tried to add the assertion that `secondary_fields_count > 1`, but it crashes when running `Double64VectorTests` on x86. Anyway, I have removed this condition and assertion in the deoptimization.

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PR Review Comment: https://git.openjdk.org/valhalla/pull/882#discussion_r1260792352