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

src/wasm/wasm-module.h

Index: src/wasm/wasm-module.h
diff --git a/src/wasm/wasm-module.h b/src/wasm/wasm-module.h
index 11ef65991d3de998cf61056587cc1c073bd801e7..44aa1b219ed84fcbccd1741b31dab06ded977fb6 100644
--- a/src/wasm/wasm-module.h
+++ b/src/wasm/wasm-module.h
@@ -24,6 +24,7 @@ class WasmCompiledModule;
 class WasmDebugInfo;
 class WasmModuleObject;
 class WasmInstanceObject;
+class WasmMemoryObject;
 
 namespace compiler {
 class CallDescriptor;
@@ -432,7 +433,8 @@ int32_t GrowInstanceMemory(Isolate* isolate,
 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,