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

[tkoenig at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37131
Bug 37131 depends on bug 69154, which changed state.

Bug 69154 Summary: [6 Regression] ICE in gfc_trans_where_2, at fortran/trans-stmt.c:5005 on *-linux
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69154

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