[Bug libfortran/78379] Processor-specific versions for matmul

[dje at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78379

--- Comment #28 from David Edelsohn <dje at gcc dot gnu.org> ---
Because PPC64LE Linux reset the base ISA level, VSX now is enabled by default,
so a function clone for VSX probably isn't necessary.  While special versions
might help AIX and PPC64BE, with lower ISA defaults, those are not the focus.