i965: Label the repclear shader "meta repclear" rather than "meta clear".

i965: Label the repclear shader "meta repclear" rather than "meta clear".

Color clears can be performed via two separate shaders - one is the
generic "meta clear" shader (in meta.c); the other is the i965 specific
"repclear" shader (in brw_meta_fast_clear.c).

Giving them separate names makes them distinguishable when reading
INTEL_DEBUG=shader_time output.

v2: Call it "meta repclear", as suggested by Jason.

Signed-off-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>