intel/fs: Lower large local arrays to scratch

Shader-db results on Kaby Lake:

    total instructions in shared programs: 14929212 -> 14880028 (-0.33%)
    instructions in affected programs: 72428 -> 23244 (-67.91%)
    helped: 6
    HURT: 2
    helped stats (abs) min: 2165 max: 15981 x̄: 8590.00 x̃: 7624
    helped stats (rel) min: 56.06% max: 74.52% x̄: 67.55% x̃: 72.08%
    HURT stats (abs)   min: 1178 max: 1178 x̄: 1178.00 x̃: 1178
    HURT stats (rel)   min: 350.60% max: 361.35% x̄: 355.97% x̃: 355.97%
    95% mean confidence interval for instructions value: -11947.03 -348.97
    95% mean confidence interval for instructions %-change: -125.72% 202.37%
    Inconclusive result (%-change mean confidence interval includes 0).

    total cycles in shared programs: 368585300 -> 342557344 (-7.06%)
    cycles in affected programs: 28144921 -> 2116965 (-92.48%)
    helped: 6
    HURT: 2
    helped stats (abs) min: 1404978 max: 7766106 x̄: 4353922.00 x̃: 3890682
    helped stats (rel) min: 82.01% max: 95.57% x̄: 89.95% x̃: 92.28%
    HURT stats (abs)   min: 47778 max: 47798 x̄: 47788.00 x̃: 47788
    HURT stats (rel)   min: 278.20% max: 282.98% x̄: 280.59% x̃: 280.59%
    95% mean confidence interval for cycles value: -5900438.73 -606550.27
    95% mean confidence interval for cycles %-change: -140.79% 146.16%
    Inconclusive result (%-change mean confidence interval includes 0).

    total spills in shared programs: 9243 -> 8901 (-3.70%)
    spills in affected programs: 2718 -> 2376 (-12.58%)
    helped: 4
    HURT: 4

    total fills in shared programs: 21831 -> 10141 (-53.55%)
    fills in affected programs: 11804 -> 114 (-99.03%)
    helped: 6
    HURT: 2

    total sends in shared programs: 815912 -> 815912 (0.00%)
    sends in affected programs: 0 -> 0
    helped: 0
    HURT: 0

    LOST:   1
    GAINED: 3

The helped shaders are all compute shaders in Aztec Ruins.  There is
also a compute shader in synmark2 OglCSDof that's helped but it doesn't
show up in above shader-db results because it went from SIMD8 to SIMD16.
That shader improves enough to yield an 15-20% performance boost to the
benchmark as a whole on my KBL laptop.  The hurt shaders are a couple
shaders in Kerbal Space Program and a couple in Aztec Ruins.

Reviewed-by: Caio Marcelo de Oliveira Filho <[email protected]>

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