[PATCH 2/4 v2][AArch64] Add support for FCCMP

[Wilco Dijkstra]

Hi Evandro,

> Here's what I had in mind when I inquired about distinguishing FCMP from
> FCCMP.  As you can see in the patch, Exynos is the only target that
> cares about it, but I wonder if ThunderX or Xgene would too.
> 
> What do you think?

The new attributes look fine (I've got a similar outstanding change), however
please don't add them to non-AArch64 cores. We only need it for thunderx.md,
cortex-a53.md, cortex-a57.md, xgene1.md and exynos-m1.md.

Wilco