[Bug preprocessor/63831] [5 Regression] r217292 causes segfaults with -MM

[emsr at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63831

--- Comment #9 from emsr at gcc dot gnu.org ---
This problem exists also with my baby __has_cpp_attribute.  I have to actually
solve this.

The real answer to this is to also give c-family/c-ppoutput.c a callback to
pretty print these built-in macros.

I'll post after tests complete.