gallium/radeon: don't use PREDICATION_OP_CLEAR
gallium/radeon: don't use PREDICATION_OP_CLEAR

Not setting the predication bit is sufficient.

Reviewed-by: Nicolai Hähnle <0d0be6cf5ad662651be2dc5dfd44aa2b09d4c1cc@amd.com>

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler