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

[jvdelisle at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=37131
Bug 37131 depends on bug 68600, which changed state.

Bug 68600 Summary: Inlined MATMUL is too slow.
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68600

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