[vector] Fix jmh comparison tests that can not reflect real performance

[Paul Sandoz]

+1

Paul.

> On Jan 2, 2020, at 8:27 PM, Qi Feng <Qi.Feng at arm.com> wrote:
> 
> Hi all,
> 
> Please help me review this patch:
> 
> http://cr.openjdk.java.net/~yzhang/vectorapi/vectorapi.jmh.and/webrev.00/
> 
> The initial value of accumulator is false. Using 'and' onto a false value makes the whole loop being optimized away. Changing the initial value to true can resolve this problem.
> 
> Also, the year in copyright notice is updated.
> 
> Thanks,
> Qi
>