[Piglit] [PATCH] Test "double negative" corner case in copy propagation.

[Eric Anholt]

On Thu, 15 Sep 2011 09:16:39 -0700, Paul Berry <stereotype441 at gmail.com> wrote:
> This patch adds two tests that exercise a subtle corner case bug found
> in Mesa with i965: If a value is negated, and then negated again, then
> copy propagation would fail to un-do the negation.
> 
> The bug only exists on i965 vertex shaders, but I went ahead and
> added the equivalent fragment shader test for completeness.

For bugs where I was definitely trying to trigger a copy-propagation
bug, I was naming them glsl-*copy-propagation before.  Not a big deal
either way.  Thanks for the tests!
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