[wasm] WebAssembly.Memory.grow() should handle the no instance case

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"
 #include "src/debug/debug-interface.h"
 #include "src/globals.h"
 #include "src/handles.h"
 #include "src/parsing/preparse-data.h"
 
 #include "src/wasm/managed.h"
 #include "src/wasm/signature-map.h"
 #include "src/wasm/wasm-opcodes.h"
 
 namespace v8 {
 namespace internal {
 
 class WasmCompiledModule;
 class WasmDebugInfo;
 class WasmModuleObject;
 class WasmInstanceObject;
+class WasmMemoryObject;
 
 namespace compiler {
 class CallDescriptor;
 class WasmCompilationUnit;
 }
 
 namespace wasm {
 class ErrorThrower;
 
 const uint32_t kWasmMagic = 0x6d736100;
@@ skipping 388 matching lines @@
 
 int32_t GetInstanceMemorySize(Isolate* isolate,
                               Handle<WasmInstanceObject> instance);
 
 int32_t GrowInstanceMemory(Isolate* isolate,
                            Handle<WasmInstanceObject> instance, uint32_t pages);
 
 Handle<JSArrayBuffer> NewArrayBuffer(Isolate* isolate, size_t size,
                                      bool enable_guard_regions);
 
-int32_t GrowWebAssemblyMemory(Isolate* isolate, Handle<Object> receiver,
+int32_t GrowWebAssemblyMemory(Isolate* isolate,
+                              Handle<WasmMemoryObject> receiver,
                               uint32_t pages);
 
 int32_t GrowMemory(Isolate* isolate, Handle<WasmInstanceObject> instance,
                    uint32_t pages);
 
 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);
 
 namespace testing {
 
 void ValidateInstancesChain(Isolate* isolate,
                             Handle<WasmModuleObject> module_obj,
                             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_