[wasm] Int64Lowering of Word64Ctz.

src/compiler/machine-operator.cc

 // Copyright 2014 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 "src/compiler/machine-operator.h"
 
 #include "src/base/lazy-instance.h"
 #include "src/compiler/opcodes.h"
 #include "src/compiler/operator.h"
 
@@ skipping 460 matching lines @@
   UNREACHABLE();
   return nullptr;
 }
 
 // On 32 bit platforms we need to get a reference to optional operators of
 // 64-bit instructions for later Int64Lowering, even though 32 bit platforms
 // don't support the original 64-bit instruction.
 const Operator* MachineOperatorBuilder::Word64PopcntPlaceholder() {
   return &cache_.kWord64Popcnt;
 }
+
+// On 32 bit platforms we need to get a reference to optional operators of
+// 64-bit instructions for later Int64Lowering, even though 32 bit platforms
+// don't support the original 64-bit instruction.
+const Operator* MachineOperatorBuilder::Word64CtzPlaceholder() {
+  return &cache_.kWord64Ctz;
+}
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8