[Bug preprocessor/91517] Pragma expansion in variadic macro reorders pragmas and breaks code

[paboyle at ph dot ed.ac.uk]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91517

--- Comment #1 from Peter Boyle <paboyle at ph dot ed.ac.uk> ---
Also occurs on 7.4.0, 8.3.0

gcc-7 (Homebrew GCC 7.4.0_2) 7.4.0
gcc-8 (Homebrew GCC 8.3.0) 8.3.0