A large amount of the cycle hurt in shader-db appears to be due to
calling discard earlier in fragment shaders.

Shader-db results (SKL):

total instructions in shared programs: 15422897 -> 15019882 (-2.61%)
instructions in affected programs: 3008913 -> 2605898 (-13.39%)
helped: 4405
HURT: 2451

total cycles in shared programs: 358349485 -> 243149152 (-32.15%)
cycles in affected programs: 246549101 -> 131348768 (-46.73%)
helped: 4248
HURT: 3744

total loops in shared programs: 4366 -> 4362 (-0.09%)
loops in affected programs: 8 -> 4 (-50.00%)
helped: 4
HURT: 0

total spills in shared programs: 23675 -> 16116 (-31.93%)
spills in affected programs: 18895 -> 11336 (-40.01%)
helped: 342
HURT: 65

total fills in shared programs: 32040 -> 29818 (-6.94%)
fills in affected programs: 18358 -> 16136 (-12.10%)
helped: 344
HURT: 65

LOST:   10
GAINED: 6

Shader-db results (SKL) - Dolphin Uber shader results removed:

total instructions in shared programs: 15240414 -> 14815652 (-2.79%)
instructions in affected programs: 2826430 -> 2401668 (-15.03%)
helped: 4390
HURT: 2411

total cycles in shared programs: 291074170 -> 202645618 (-30.38%)
cycles in affected programs: 179273786 -> 90845234 (-49.33%)
helped: 4193
HURT: 3744

total loops in shared programs: 3666 -> 3662 (-0.11%)
loops in affected programs: 8 -> 4 (-50.00%)
helped: 4
HURT: 0

total spills in shared programs: 21101 -> 5728 (-72.85%)
spills in affected programs: 16321 -> 948 (-94.19%)
helped: 342
HURT: 10

total fills in shared programs: 28485 -> 15587 (-45.28%)
fills in affected programs: 14803 -> 1905 (-87.13%)
helped: 344
HURT: 10

LOST:   10
GAINED: 6