v3d: Use the early_fragment_tests flag for the shader's disable-EZ field.

Apparently we need disable-EZ flagged, not just "does Z writes".

Fixes
dEQP-GLES31.functional.image_load_store.early_fragment_tests.no_early_fragment_tests_depth_fbo
on 7278, even though it passed in simulation.

Signed-off-by: Eric Anholt <eric@anholt.net>
Fixes: 051a41d3d5 ("v3d: Add support for the early_fragment_tests flag.")

src/broadcom/compiler/v3d_compiler.h

@@ -520,6 +520,7 @@ struct v3d_compile {
         uint32_t centroid_flags[BITSET_WORDS(V3D_MAX_FS_INPUTS)];
 
         bool uses_center_w;
+        bool writes_z;
 
         struct v3d_ubo_range *ubo_ranges;
         bool *ubo_range_used;
@@ -717,7 +718,7 @@ struct v3d_fs_prog_data {
         uint32_t centroid_flags[((V3D_MAX_FS_INPUTS - 1) / 24) + 1];
 
         bool writes_z;
-        bool discard;
+        bool disable_ez;
         bool uses_center_w;
 };