[Bug 92744] [g965 Regression bisected] Performance regression and piglit assertions due to liveness analysis

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=92744

--- Comment #2 from Mark Janes <mark.a.janes at intel.com> ---
The big performance regression was for g965.  I noted it when I looked at one
of the slower builds, where platforms other than g965 finished in 1-2 minutes
but g965 finished in 15 minutes.

This behavior is not consistent.  It may depend on the machine executing the
tests (seemed like the slow runs were on BDW, but I wouldn't spend time on the
low quality of this information).

I'll test your patch and see if it affects the failures and the perf.

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