nine: Drop use of TGSI_OPCODE_CND.
nine: Drop use of TGSI_OPCODE_CND.

This was the only state tracker emitting it, and hardware was just having
to lower it anyway (or failing to lower it at all).

v2: Extracted from a larger patch by Jose (which also dropped DP2A), fixed
    to actually not reference TGSI_OPCODE_CND.  Change by anholt.

Reviewed-by: Jose Fonseca <61b5a29db2c0650f7c8510f93eece059c1b09320@vmware.com>
Reviewed-by: Axel Davy <2b6ef604b998fb81662f85c329e4fc020eae8e5d@ens.fr>
Reviewed-by: David Heidelberg <aa743a0aaec8f7d7a1f01442503957f4d7a2d634@ixit.cz>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler