[wasm] New implementation of popcnt and ctz.

src/external-reference-table.cc

Index: src/external-reference-table.cc
diff --git a/src/external-reference-table.cc b/src/external-reference-table.cc
index 29a2474b091fbbb2b00910e3c9a430659fc1eb16..8f1e1f339040951b6655ae6351074935a15377ed 100644
--- a/src/external-reference-table.cc
+++ b/src/external-reference-table.cc
@@ -134,6 +134,14 @@ ExternalReferenceTable::ExternalReferenceTable(Isolate* isolate) {
       "wasm::uint64_div");
   Add(ExternalReference::wasm_uint64_mod(isolate).address(),
       "wasm::uint64_mod");
+  Add(ExternalReference::wasm_word32_ctz(isolate).address(),
+      "wasm::word32_ctz");
+  Add(ExternalReference::wasm_word64_ctz(isolate).address(),
+      "wasm::word64_ctz");
+  Add(ExternalReference::wasm_word32_popcnt(isolate).address(),
+      "wasm::word32_popcnt");
+  Add(ExternalReference::wasm_word64_popcnt(isolate).address(),
+      "wasm::word64_popcnt");
   Add(ExternalReference::f64_acos_wrapper_function(isolate).address(),
       "f64_acos_wrapper");
   Add(ExternalReference::f64_asin_wrapper_function(isolate).address(),