[PATCH][AArch64] Enable -frename-registers at -O2 and higher

[Dr. Philipp Tomsich]

> On 10 Jun 2016, at 01:28, Jim Wilson <jim.wilson@linaro.org> wrote:
> 
> On Tue, May 31, 2016 at 2:56 AM, James Greenhalgh
> <james.greenhalgh@arm.com> wrote:
>> As you're proposing to have this on by default, I'd like to give a chance
>> to hear whether there is consensus as to this being the right choice for
>> the thunderx, xgene1, exynos-m1 and qdf24xx subtargets.

Testing on XGene-1 and XGene-2 shows a small improvement (0.8% overall)
on SPEC2006 and a negligible improvement for CoreMark, just in line with 
what we’d expect. 

So from our end, it’s a vote for “on by default”.

Regards,
Phil.