Why after import ASYNCIFY, the project compile so slow

Please include the following in your bug report:

**Version of emscripten/emsdk:**

emcc (Emscripten gcc/clang-like replacement + linker emulating GNU ld) 3.1.55 (165133b1cc977f0b9a277e42ef809b823157189c)
clang version 19.0.0git (https:/github.com/llvm/llvm-project 6c7805d5d186a6d1263f90b8033ad85e2d2633d7)
Target: wasm32-unknown-emscripten
Thread model: posix

**Failing command line in full:**
NA

**Full link command and output with `-v` appended:**

set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_C_STANDARD_REQUIRED ON)
set(CMAKE_C_STANDARD 99)

set(CMAKE_BUILD_TYPE, "Debug")

set(CMAKE_CXX_FLAGS "-Wall -Wextra -Wno-comment")
set(CMAKE_CXX_FLAGS_DEBUG "-g")
set(CMAKE_CXX_FLAGS_RELEASE "-O3")

set(CMAKE_C_FLAGS "-Wall -Wextra -Wno-comment")
set(CMAKE_C_FLAGS_DEBUG "-g")
set(CMAKE_C_FLAGS_RELEASE "-O3")
set(CMAKE_EXE_LINKER_FLAGS "-sEXPORTED_FUNCTIONS=_malloc,_free -sALLOW_TABLE_GROWTH -sEXPORTED_RUNTIME_METHODS=dynCall,UTF8ToString,FS -sDYNCALLS --bind -sNO_DISABLE_EXCEPTION_CATCHING -sALLOW_MEMORY_GROWTH -sASYNCIFY --preload-file Layout.xsl --preload-file Code.xml --preload-file Code2.xml --preload-file Resource.rc --preload-file Res")
set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -lidbfs.js")

I am trying to import ASYNCIFY to our poject, the project code is huge
The usage sample code as following:
I try to define a function "WaitModalDialogClose" to listen for the H5 dialog component closing event.
and it will be used in ShowModal function.

But after import ASYNCIFY configuration to project,
in debug version, the compiling and linking are slow. about 30 min in my PC.
Before add ASYNCIFY, the speed about 5 min in my PC.

Does anyone know why compiling and linking can be so slow?
Is there any way to increase the speed?

```cpp
EM_ASYNC_JS(INT_PTR, WaitModalDialogClose, (const char* strDialogId, int nLength), {

var dialogElementId = UTF8ToString(strDialogId, nLength);
dialogElement = document.getElementById(dialogElementId);

//create promise to waiting dialog close event
var promise = await new Promise((resolve) =>{

function handleCloseEvent(event)
{
dialogElement.removeEventListener("CloseDialog", handleCloseEvent);
resolve(event.detail.data);
}
dialogElement.addEventListener("CloseDialog", handleCloseEvent);
}).then((response)=> {
return response;
});
//return close status
return promise;
});

INT_PTR CDialogContentContextItem::ShowModal()
{
return WaitModalDialogClose(m_strDialogId.c_str(), m_strDialogId.length());
}

```