[Piglit] [PATCH v4] glsl-4.50: add a test for helper invocations

[Matt Turner]

On Thu, Nov 12, 2015 at 2:55 PM, Glenn Kennard <glenn.kennard at gmail.com> wrote:
> Tested on r600g implementation
>
> Signed-off-by: Glenn Kennard <glenn.kennard at gmail.com>
> ---

I used this to test the i965 implementation as well. Please push it.