Revert "i965: Do FS SLT, SGT, and friends using CMP, SEL instead of CMP, MOV, MOV."

This reverts commit 46450c1f3f.  I was
wrong about null reg behavior -- it reads undefined, not 0.  And
they're not kidding.

src/mesa/drivers/dri/i965/brw_wm_emit.c

@@ -545,8 +545,11 @@ void emit_sop(struct brw_compile *p,
    for (i = 0; i < 4; i++) {
       if (mask & (1<<i)) {	
 	 brw_push_insn_state(p);
-	 brw_CMP(p, brw_null_reg(), cond, arg1[i], arg0[i]);
-	 brw_SEL(p, dst[i], brw_null_reg(), brw_imm_f(1.0));
+	 brw_CMP(p, brw_null_reg(), cond, arg0[i], arg1[i]);
+	 brw_set_predicate_control(p, BRW_PREDICATE_NONE);
+	 brw_MOV(p, dst[i], brw_imm_f(0));
+	 brw_set_predicate_control(p, BRW_PREDICATE_NORMAL);
+	 brw_MOV(p, dst[i], brw_imm_f(1.0));
 	 brw_pop_insn_state(p);
       }
    }