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

[Yi Kong]

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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