[Bug preprocessor/96069] -ffile-prefix-map does not affect print in gfortran

[yyc1992 at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=96069

--- Comment #8 from Yichao Yu <yyc1992 at gmail dot com> ---
OK, done. It would be nice to mention it on
https://gcc.gnu.org/contribute.html#patches