[wasm] Use weak reference for wasm deopt data.

src/runtime/runtime-wasm.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/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/assembler.h"
 #include "src/compiler/wasm-compiler.h"
 #include "src/conversions.h"
@@ skipping 19 matching lines @@
   Handle<JSObject> module_object;
 
   {
     // Get the module JSObject
     DisallowHeapAllocation no_allocation;
     const Address entry = Isolate::c_entry_fp(isolate->thread_local_top());
     Address pc =
         Memory::Address_at(entry + StandardFrameConstants::kCallerPCOffset);
     Code* code =
         isolate->inner_pointer_to_code_cache()->GetCacheEntry(pc)->code;
-    FixedArray* deopt_data = code->deoptimization_data();
-    DCHECK(deopt_data->length() == 2);
-    module_object = Handle<JSObject>::cast(handle(deopt_data->get(0), isolate));
-    CHECK(!module_object->IsNull(isolate));
+    Object* undefined = *isolate->factory()->undefined_value();
+    Object* owning_instance = wasm::GetOwningWasmInstance(undefined, code);
+    CHECK_NOT_NULL(owning_instance);
+    CHECK_NE(owning_instance, undefined);
+    module_object = handle(JSObject::cast(owning_instance), isolate);
   }
 
   Address old_mem_start, new_mem_start;
   uint32_t old_size, new_size;
 
   // Get mem buffer associated with module object
   Handle<Object> obj(module_object->GetInternalField(kWasmMemArrayBuffer),
                      isolate);
 
   if (obj->IsUndefined(isolate)) {
@@ skipping 57 matching lines @@
 }
 
 RUNTIME_FUNCTION(Runtime_WasmThrowTypeError) {
   HandleScope scope(isolate);
   DCHECK_EQ(0, args.length());
   THROW_NEW_ERROR_RETURN_FAILURE(
       isolate, NewTypeError(MessageTemplate::kWasmTrapTypeError));
 }
 }  // namespace internal
 }  // namespace v8