[vector] Min/Max support cleanup for x86

[John Rose]

On Feb 7, 2020, at 3:45 PM, Viswanathan, Sandhya <sandhya.viswanathan at intel.com> wrote:
> 
> Hi John,
>  
> Thanks a lot for your inputs. Please find below the webrev with the change:
> http://cr.openjdk.java.net/~sviswanathan/vectorIntrinsics/MinMaxCleanup/webrev.01/
>  

Thanks, that makes it easier to find all the related API bits.

I don’t know what to do about the difference between opcode
and is_min; can that be conveniently unified also?  Sorry to
be picky here…

— John