[Bug c++/125819] New: [reflection] don't include built-ins in members_of

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=125819

            Bug ID: 125819
           Summary: [reflection] don't include built-ins in members_of
           Product: gcc
           Version: 17.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: mpolacek at gcc dot gnu.org
  Target Milestone: ---

Currently, we include all the built-ins like __builtin_fdimf32x in the result
of members_of.  We should skip them.

```
#include <meta>

consteval {
    members_of(^^::, std::meta::access_context::unchecked());
}
```