target-xtensa: de-optimize EXTUI

Now that "and" with 0xff, 0xffff and 0xffffffff and "shr" with 0 shift
are optimized in tcg/tcg-op.h there is no need to do it in
target-xtensa/translate.c.
Acked-by: NMax Filippov <jcmvbkbc@gmail.com>
Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>

target-xtensa/translate.c

@@ -1829,26 +1829,8 @@ static void disas_xtensa_insn(DisasContext *dc)
                 int maskimm = (1 << (OP2 + 1)) - 1;
 
                 TCGv_i32 tmp = tcg_temp_new_i32();
-
-                if (shiftimm) {
-                    tcg_gen_shri_i32(tmp, cpu_R[RRR_T], shiftimm);
-                } else {
-                    tcg_gen_mov_i32(tmp, cpu_R[RRR_T]);
-                }
-
-                switch (maskimm) {
-                case 0xff:
-                    tcg_gen_ext8u_i32(cpu_R[RRR_R], tmp);
-                    break;
-
-                case 0xffff:
-                    tcg_gen_ext16u_i32(cpu_R[RRR_R], tmp);
-                    break;
-
-                default:
-                    tcg_gen_andi_i32(cpu_R[RRR_R], tmp, maskimm);
-                    break;
-                }
+                tcg_gen_shri_i32(tmp, cpu_R[RRR_T], shiftimm);
+                tcg_gen_andi_i32(cpu_R[RRR_R], tmp, maskimm);
                 tcg_temp_free(tmp);
             }
             break;