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

src/wasm/wasm-js.cc

Index: src/wasm/wasm-js.cc
diff --git a/src/wasm/wasm-js.cc b/src/wasm/wasm-js.cc
index 0a81a528895a5118947ea2d0fb5c53a3c4379027..0354934c30446e2dec2330b5516211147e40ea26 100644
--- a/src/wasm/wasm-js.cc
+++ b/src/wasm/wasm-js.cc
@@ -698,6 +698,7 @@ void WebAssemblyMemoryGrow(const v8::FunctionCallbackInfo<v8::Value>& args) {
     thrower.RangeError("Unable to grow instance memory.");
     return;
   }
+  i::wasm::DetachWebAssemblyMemoryBuffer(i_isolate, old_buffer);
   v8::ReturnValue<v8::Value> return_value = args.GetReturnValue();
   return_value.Set(ret);
 }