[Bug 81157] [BDW]Piglit some spec_glsl-1.50_execution_built-in-functions* cases fail

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81157

--- Comment #5 from Matt Turner <mattst88 at gmail.com> ---
I don't know what the absolute value source modifier does on logic
instructions, but it doesn't seem to give the absolute value of a negative
argument. It doesn't appear to touch positive arguments though.

Not sure how I can investigate further, without being able to create an aub
file.

I suspect we should just disable copy propagation of (abs) arguments into
logical instructions on Broadwell.

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