tcg: Add clz and ctz opcodes

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Richard Henderson <rth@twiddle.net>
diff --git a/tcg/tcg.h b/tcg/tcg.h
index 144bdab..e026282 100644
--- a/tcg/tcg.h
+++ b/tcg/tcg.h
@@ -111,6 +111,8 @@
 #define TCG_TARGET_HAS_eqv_i64          0
 #define TCG_TARGET_HAS_nand_i64         0
 #define TCG_TARGET_HAS_nor_i64          0
+#define TCG_TARGET_HAS_clz_i64          0
+#define TCG_TARGET_HAS_ctz_i64          0
 #define TCG_TARGET_HAS_deposit_i64      0
 #define TCG_TARGET_HAS_extract_i64      0
 #define TCG_TARGET_HAS_sextract_i64     0