RFR: 8268151: Vector API toShuffle optimization [v2]

[Sandhya Viswanathan]

On Fri, 4 Jun 2021 13:03:24 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

>> Sandhya Viswanathan has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Implement review comments
>
> Looks good. 
> 
> One inefficiency I noticed is that repeated `toVector()`/`toShuffle` leave a trail of redundant `VectorCastB2X`/`VectorCast[S..L]2X` nodes behind.

@iwanowww @XiaohongGong Thanks a lot for the review.
@iwanowww I will take up the redundant VectorCastB2X/VectorCast[S..L]2X conversion optimizations separately.

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PR: https://git.openjdk.java.net/jdk/pull/4326