[clang] [clang] Warn when builtin names are used outside of invocations (PR #96097)

[Vlad Serebrennikov via cfe-commits]

Endilll wrote:

```
/usr/lib/gcc/x86_64-linux-gnu/11/../../../../include/c++/11/bits/uniform_int_dist.h:250:31: error: expected unqualified-id
          static_assert(!_Up_traits::__is_signed, "U must be unsigned");
```
Results from CI are not making this any better.

https://github.com/llvm/llvm-project/pull/96097