RFR: 8306302: C2 Superword fix: use VectorMaskCmp and VectorBlend instead of CMoveVF/D [v2]

[Emanuel Peter]

On Fri, 19 May 2023 06:11:22 GMT, Fei Gao <fgao at openjdk.org> wrote:

>>> @fg1417 Are you ok with how I worded it now?
>> 
>> Oh, yes. Clear enough!
>
>> @fg1417 Is there anything you still want me to change before you could approve this PR?
> 
> Sorry for my delay. I assume that the flags `-XX:+UseCMoveUnconditionally` and `-XX:+UseVectorCmov` over all jtreg passed.

Ah yes, they have passed indeed. With and without those flags, up to tier5 and stress testing 😊

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PR Review Comment: https://git.openjdk.org/jdk/pull/13493#discussion_r1198584506