Intellisense not handling attributes for ext_vector_type

Environment

• OS and version: macos12.6, M1
• VS Code: Version: 1.72.2 (Universal)
• C/C++ extension: C/C++ v1.13.2 (Pre-release)

c_cpp_properties.json settings that I've tried
"intelliSenseMode": "macos-gcc-arm64",
and
"intelliSenseMode": "macos-clang-arm64",

Bug Summary and Steps to Reproduce

Bug Summary:
Intellisense reports an error expression must have class type but it has type "vector4"C/C++(153) but it doesn't register as an error during compilation. Xcode does not report this code as problematic either.

Steps to reproduce:
define a vector
typedef float vector4 __attribute__((ext_vector_type(4)));

Refer to a value in the vector using (x, y, z, w) rather than indexing

vector4 V;
V.x = 1.0;

Intellisense returns
expression must have class type but it has type "vector4"C/C++(153)

Expected behavior

I don't think this should be reported as an error in Intellisense.

If the error is correct then is there something obvious that I'm missing in the c_cpp_properties.json?

Code sample and Logs

{
    "configurations": [
        {
            "name": "VectorTest",
            "includePath": [
                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks/Accelerate.framework/Frameworks/vecLib.framework/Headers/"
            ],
            "defines": [],
            "macFrameworkPath": [
                "/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk/System/Library/Frameworks",
                "/System/Library/Frameworks",
                "/Library/Frameworks"
            ],
            "compilerPath": "/usr/bin/clang",
            "cStandard": "c89",
            "cppStandard": "c++14",
            "intelliSenseMode": "macos-clang-arm64",
            "browse": {
                "limitSymbolsToIncludedHeaders": true
            }
        }
    ],
    "version": 4
}

### Screenshots

_No response_

### Additional context

_No response_

Inizia riproducendo la diagnostica con l’esempio ext_vector_type e il file c_cpp_properties.json fornito usando macos-clang-arm64. Confronta il risultato di IntelliSense con la compilazione clang e Xcode, quindi traccia il modo in cui l’estensione gestisce gli attributi dei vettori; il lavoro è completo quando l’accesso valido ai membri non segnala più C/C++(153), con un test di regressione che copra l’esempio.