[clang] [clang] Add support for MSVC force inline attrs (PR #185282)

[Trung Nguyen via cfe-commits]

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+// RUN: %clang_cc1 -verify -fsyntax-only -std=c++23 %s
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trungnt2910 wrote:

It seems like the check for attribute arguments is done before the check for Microsoft extensions.

I'm modifying the tests to expect errors when doing things like `[[msvc::forceinline_calls("foo")]]` on a non-Microsoft compilation.

I am not sure if there is any random code targeting UNIX that relies on such a thing as `[[msvc::forceinline_calls("foo")]]` to be valid.

https://github.com/llvm/llvm-project/pull/185282