[wasm] Detach memory buffer only when GrowMemory is called from the JS API

src/wasm/wasm-module.h

 // 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.
 
 #ifndef V8_WASM_MODULE_H_
 #define V8_WASM_MODULE_H_
 
 #include <memory>
 
 #include "src/api.h"
@@ skipping 403 matching lines @@
 Handle<JSArrayBuffer> NewArrayBuffer(Isolate* isolate, size_t size,
                                      bool enable_guard_regions);
 
 int32_t GrowWebAssemblyMemory(Isolate* isolate,
                               Handle<WasmMemoryObject> receiver,
                               uint32_t pages);
 
 int32_t GrowMemory(Isolate* isolate, Handle<WasmInstanceObject> instance,
                    uint32_t pages);
 
+void DetachWebAssemblyMemoryBuffer(Isolate* isolate,
+                                   Handle<JSArrayBuffer> buffer);
+
 void UpdateDispatchTables(Isolate* isolate, Handle<FixedArray> dispatch_tables,
                           int index, Handle<JSFunction> js_function);
 
 void GrowDispatchTables(Isolate* isolate, Handle<FixedArray> dispatch_tables,
                         uint32_t old_size, uint32_t count);
 
 //============================================================================
 //== Compilation and instantiation ===========================================
 //============================================================================
 V8_EXPORT_PRIVATE bool SyncValidate(Isolate* isolate, ErrorThrower* thrower,
@@ skipping 70 matching lines @@
                             int instance_count);
 void ValidateModuleState(Isolate* isolate, Handle<WasmModuleObject> module_obj);
 void ValidateOrphanedInstance(Isolate* isolate,
                               Handle<WasmInstanceObject> instance);
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_WASM_MODULE_H_