[wasm] Use handles in wasm::GetDebugInfo.

src/wasm/wasm-module.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 "src/base/atomic-utils.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
 #include "src/property-descriptor.h"
 #include "src/v8.h"
 
@@ skipping 1260 matching lines @@
     }
     return true;
   }
   return false;
 }
 
 SeqOneByteString* GetWasmBytes(JSObject* wasm) {
   return SeqOneByteString::cast(wasm->GetInternalField(kWasmModuleBytesString));
 }
 
-WasmDebugInfo* GetDebugInfo(JSObject* wasm) {
-  Object* info = wasm->GetInternalField(kWasmDebugInfo);
-  if (!info->IsUndefined(wasm->GetIsolate())) return WasmDebugInfo::cast(info);
-  Handle<WasmDebugInfo> new_info = WasmDebugInfo::New(handle(wasm));
+Handle<WasmDebugInfo> GetDebugInfo(Handle<JSObject> wasm) {
+  Handle<Object> info(wasm->GetInternalField(kWasmDebugInfo),
+                      wasm->GetIsolate());
+  if (!info->IsUndefined(wasm->GetIsolate()))
+    return Handle<WasmDebugInfo>::cast(info);
+  Handle<WasmDebugInfo> new_info = WasmDebugInfo::New(wasm);
   wasm->SetInternalField(kWasmDebugInfo, *new_info);
-  return *new_info;
+  return new_info;
 }
 
 bool UpdateWasmModuleMemory(Handle<JSObject> object, Address old_start,
                             Address new_start, uint32_t old_size,
                             uint32_t new_size) {
   DisallowHeapAllocation no_allocation;
   if (!IsWasmObject(*object)) {
     return false;
   }
 
@@ skipping 96 matching lines @@
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
   thrower.Error("WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8