RFR: 8216392: Enable cmovP_mem and cmovP_memU instructions

[Andrew Haley]

On 1/17/19 7:51 PM, B. Blaser wrote:
> Here it is on intel xeon with 5*10e9 iterations:
> * mov+cmov = 10.94s
> * cmov = 10.15s
> 
> Thoughts?

It looks like there's not much of a performance difference, but it might
help by freeing a register. OTOH, we'd still need to be sure we weren't
introducing a regression. We'd have to make sure that implicit null checks
work.

-- 
Andrew Haley
Java Platform Lead Engineer
Red Hat UK Ltd. <https://www.redhat.com>
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