[Bug fortran/37131] inline matmul for small matrix sizes

[sandra at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37131
Bug 37131 depends on bug 65819, which changed state.

Bug 65819 Summary: overzealous checking in gfc_check_dependency for identical=true
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65819

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED