i965: disable loop unrolling in GLSL IR

There is a single regression in loop unrolling which is:

loops HURT:   shaders/orbital_explorer.shader_test GS SIMD8:    0 -> 1

However the loop is huge so it seems reasonable not to unroll it. It's
surprising that GLSL IR does unroll it.

shader-db results BDW:

total instructions in shared programs: 13037455 -> 13036947 (-0.00%)
instructions in affected programs: 17982 -> 17474 (-2.83%)
helped: 63
HURT: 25

total cycles in shared programs: 262217870 -> 262227990 (0.00%)
cycles in affected programs: 2287046 -> 2297166 (0.44%)
helped: 969
HURT: 844

total loops in shared programs: 2951 -> 2952 (0.03%)
loops in affected programs: 0 -> 1
helped: 0
HURT: 1

LOST:   0
GAINED: 1

Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
diff --git a/src/mesa/drivers/dri/i965/brw_compiler.c b/src/mesa/drivers/dri/i965/brw_compiler.c
index d7900a7..fa8a772 100644
--- a/src/mesa/drivers/dri/i965/brw_compiler.c
+++ b/src/mesa/drivers/dri/i965/brw_compiler.c
@@ -122,7 +122,7 @@
 
    /* We want the GLSL compiler to emit code that uses condition codes */
    for (int i = 0; i < MESA_SHADER_STAGES; i++) {
-      compiler->glsl_compiler_options[i].MaxUnrollIterations = 32;
+      compiler->glsl_compiler_options[i].MaxUnrollIterations = 0;
       compiler->glsl_compiler_options[i].MaxIfDepth =
          devinfo->gen < 6 ? 16 : UINT_MAX;