Including stdatomic.h causes size_t to report the wrong type in Intellisense #14825

Environment

• OS and Version: Windows 11 Pro, 26H2
• VS Code Version: 1.141.0
• C/C++ Extension Version: 1.34.4
• If using SSH remote, specify OS of remote machine: N/A

Bug Summary and Steps to Reproduce

Bug Summary:

Including stdatomic.h causes havoc with the size_t type, causing Intellisense failures.

Steps to reproduce:

Create a c source file that includes stdatomic.h

Make a variable of size_t (e.g size_t capacity = 0) in the code.
Hover over size_t
It will report that size_t is defined as typedef int size_t(bool)
This is incorrect.

If you remove or comment out the stdatomic.h header and hover over size_t
It will report that size_t is defined as unsigned long long size_t
This is correct.

Apparently, this is an issue in Visual Studio as well.

Configuration and Logs

{
    "configurations": [
        {
            "name": "Win32",
            "includePath": [
                "${workspaceFolder}/**",
                "${env:INCLUDE}"
            ],
            "defines": [
                "_DEBUG",
                "UNICODE",
                "_UNICODE"
            ],
            "windowsSdkVersion": "10.0.28000.0",
            "compilerPath": "cl.exe",
            "cStandard": "c11",
            "cppStandard": "c++23",
            "intelliSenseMode": "windows-msvc-x64",
            "compilerArgs": [
                "/std:c17",
                "/experimental:c11atomics"
            ]
        }
    ],
    "version": 4
}

Other Extensions

N/A

Additional context

Intellisense is completely confused about how to parse the stdatomic.h header, or more precisely, the platform specific of the header that stdatomic.h includes.