target-cris: Use clz opcode

Signed-off-by: Richard Henderson <rth@twiddle.net>
diff --git a/target/cris/translate.c b/target/cris/translate.c
index b910427..0ee05ca 100644
--- a/target/cris/translate.c
+++ b/target/cris/translate.c
@@ -767,7 +767,7 @@
         t_gen_subx_carry(dc, dst);
         break;
     case CC_OP_LZ:
-        gen_helper_lz(dst, b);
+        tcg_gen_clzi_tl(dst, b, TARGET_LONG_BITS);
         break;
     case CC_OP_MULS:
         tcg_gen_muls2_tl(dst, cpu_PR[PR_MOF], a, b);