[wasm] Int64Lowering of Word64Clz.

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 50 matching lines @@
   V(I64Eq, true)                \
   V(I64Ne, true)                \
   V(I64LtS, true)               \
   V(I64LeS, true)               \
   V(I64LtU, true)               \
   V(I64LeU, true)               \
   V(I64GtS, true)               \
   V(I64GeS, true)               \
   V(I64GtU, true)               \
   V(I64GeU, true)               \
-  V(I64Clz, false)              \
+  V(I64Clz, true)               \
   V(I64Ctz, false)              \
   V(I64Popcnt, !MIPS_OR_X87)    \
   V(I32ConvertI64, true)        \
   V(I64SConvertF32, false)      \
   V(I64SConvertF64, false)      \
   V(I64UConvertF32, false)      \
   V(I64UConvertF64, false)      \
   V(I64SConvertI32, true)       \
   V(I64UConvertI32, true)       \
   V(F32SConvertI64, true)       \
@@ skipping 1216 matching lines @@
   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));
   }
 }