[wasm] New implementation of popcnt and ctz.

src/wasm/wasm-external-refs.h

Index: src/wasm/wasm-external-refs.h
diff --git a/src/wasm/wasm-external-refs.h b/src/wasm/wasm-external-refs.h
index d7752aa24d96bcce6674e68df30ea79df94db408..ac938d6d67d9147d9ae36a54fbf8009f843b984a 100644
--- a/src/wasm/wasm-external-refs.h
+++ b/src/wasm/wasm-external-refs.h
@@ -50,8 +50,15 @@ int32_t int64_mod_wrapper(int64_t* dst, int64_t* src);
 int32_t uint64_div_wrapper(uint64_t* dst, uint64_t* src);
 
 int32_t uint64_mod_wrapper(uint64_t* dst, uint64_t* src);
+
+uint32_t word32_ctz_wrapper(uint32_t* input);
+
+uint32_t word64_ctz_wrapper(uint64_t* input);
+
+uint32_t word32_popcnt_wrapper(uint32_t* input);
+
+uint32_t word64_popcnt_wrapper(uint64_t* input);
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
-
 #endif