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

src/wasm/wasm-debug.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 "src/wasm/wasm-debug.h"
 
 #include "src/assert-scope.h"
 #include "src/debug/debug.h"
 #include "src/factory.h"
 #include "src/isolate.h"
@@ skipping 140 matching lines @@
   arr->set(kWasmDebugInfoWasmBytesHash, *hash_obj);
 
   return Handle<WasmDebugInfo>::cast(arr);
 }
 
 bool WasmDebugInfo::IsDebugInfo(Object *object) {
   if (!object->IsFixedArray()) return false;
   FixedArray *arr = FixedArray::cast(object);
   Isolate *isolate = arr->GetIsolate();
   return arr->length() == kWasmDebugInfoNumEntries &&
-         IsWasmObject(arr->get(kWasmDebugInfoWasmObj)) &&
+         IsWasmModule(arr->get(kWasmDebugInfoWasmObj)) &&
          arr->get(kWasmDebugInfoWasmBytesHash)->IsNumber() &&
          (arr->get(kWasmDebugInfoFunctionByteOffsets)->IsUndefined(isolate) ||
           arr->get(kWasmDebugInfoFunctionByteOffsets)->IsByteArray()) &&
          (arr->get(kWasmDebugInfoFunctionScripts)->IsUndefined(isolate) ||
           arr->get(kWasmDebugInfoFunctionScripts)->IsFixedArray());
 }
 
 WasmDebugInfo *WasmDebugInfo::cast(Object *object) {
   DCHECK(IsDebugInfo(object));
   return reinterpret_cast<WasmDebugInfo *>(object);
@@ skipping 135 matching lines @@
       left = mid;
     } else {
       right = mid;
     }
   }
   // There should be an entry for each position that could show up on the stack
   // trace:
   DCHECK_EQ(byte_offset, offset_table->get_int(2 * left));
   return offset_table->get_int(2 * left + 1);
 }