__builtin_coro_* methods aren't recognized by IntelliSense in gcc mode with -fcoroutines arg

[sean-mcmanus]

Repro is with 1.2.0-insiders:

{
    "configurations": [
        {
            "name": "Linux",
            "includePath": [
                "${workspaceFolder}/**"
            ],
            "intelliSenseMode": "gcc-x64",
            "cppStandard": "c++20",
            "compilerPath": "/usr/bin/g++-10",
            "compilerArgs": ["-fcoroutines"]
        }
    ],
    "version": 4
}

    struct foo
    {
      bool done() const noexcept { return __builtin_coro_done(_M_fr_ptr); }
      void resume() const { __builtin_coro_resume(_M_fr_ptr); }
      void destroy() const { __builtin_coro_destroy(_M_fr_ptr); }
    protected:
      void* _M_fr_ptr;
  };

Bug: IntelliSense doesn't recognize the __builtin_coro_* methods. It works with clang mode (which doesn't need the -fcoroutines arg). The case is valid with g++ 10 or newer.

[sean-mcmanus]

Fixed with https://github.com/microsoft/vscode-cpptools/releases/tag/1.2.0-insiders2