[wasm] Add I64Eqz operator.

test/cctest/wasm/test-run-wasm-64.cc

 // Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 
 #include "src/wasm/wasm-macro-gen.h"
 
@@ skipping 1183 matching lines @@
                                   WASM_I64_SCONVERT_I32(WASM_GET_LOCAL(0)))),
               WASM_ZERO));
 
   *global = 0xFFFFFFFFFFFFFFFFLL;
   for (int i = 9; i < 444444; i += 111111) {
     int64_t expected = *global & i;
     r.Call(i);
     CHECK_EQ(expected, *global);
   }
 }
+
+TEST(Run_WasmI64Eqz) {
+  REQUIRE(I64Eq);
+
+  WasmRunner<int32_t> r(MachineType::Int64());
+  BUILD(r, WASM_I64_EQZ(WASM_GET_LOCAL(0)));
+
+  FOR_INT64_INPUTS(i) {
+    int32_t result = *i == 0 ? 1 : 0;
+    CHECK_EQ(result, r.Call(*i));
+  }
+}