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intel/compiler: fix derivative on y axis implementation

Lionel Landwerlin requested to merge llandwerlin/mesa:review/icl-ddy-fixes into master

This rewrites the ddy in EXECUTE_4 mode with a loop to make it more obvious what is going on and also sets the group each of the 4 threads in the groups are supposed to execute.

Fixes the following CTS tests :

dEQP-VK.glsl.derivate.dfdyfine.dynamic_*

Signed-off-by: Lionel Landwerlin lionel.g.landwerlin@intel.com Cc: mesa-stable@lists.freedesktop.org

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