[wasm] Use a Managed<WasmModule> to hold metadata about modules.

test/fuzzer/wasm-code.cc

 // Copyright 2016 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 <stddef.h>
 #include <stdint.h>
 
 #include "include/v8.h"
 #include "src/isolate.h"
 #include "src/objects.h"
@@ skipping 38 matching lines @@
 
   ZoneBuffer buffer(&zone);
   builder.WriteTo(buffer);
 
   v8::internal::wasm::testing::SetupIsolateForWasmModule(i_isolate);
 
   v8::internal::HandleScope scope(i_isolate);
 
   ErrorThrower interpreter_thrower(i_isolate, "Interpreter");
   std::unique_ptr<const WasmModule> module(testing::DecodeWasmModuleForTesting(
-      i_isolate, &zone, &interpreter_thrower, buffer.begin(), buffer.end(),
+      i_isolate, &interpreter_thrower, buffer.begin(), buffer.end(),
       v8::internal::wasm::ModuleOrigin::kWasmOrigin));
 
   if (module == nullptr) {
     return 0;
   }
   int32_t result_interpreted;
   {
     WasmVal args[] = {WasmVal(1), WasmVal(2), WasmVal(3)};
     result_interpreted = testing::InterpretWasmModule(
         i_isolate, &interpreter_thrower, module.get(), 0, args);
@@ skipping 24 matching lines @@
     i_isolate->clear_pending_exception();
   } else {
     if (result_interpreted != result_compiled) {
       V8_Fatal(__FILE__, __LINE__, "WasmCodeFuzzerHash=%x",
                v8::internal::StringHasher::HashSequentialString(
                    data, static_cast<int>(size), WASM_CODE_FUZZER_HASH_SEED));
     }
   }
   return 0;
 }