[LLVMdev] Use perf tool for more accurate time measuring on Linux

[Yi Kong]

As all review comments were taken into account, I believe the patch is
ready to be committed. I plan on doing so sometime tomorrow unless any
objection is raised by then.

On 22 May 2014 11:34, Yi Kong <kongy.dev at gmail.com> wrote:
> Updated.
>
> On 22 May 2014 07:54, Chandler Carruth <chandlerc at google.com> wrote:
>> I should have mentioned this idea previously, but what about making the
>> script gracefully degrade in the absence of these tools? That way builders
>> won't regress but ones with the tools will just get better timing.
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