[patch, fortran, committed] Fix size of matmul calculation for a special case

[Thomas Koenig]

Hello world,

I have just committed as obvious a patch fixing a wrong
calculation for allocating the size of a return variable
in inline matmul (PR 80904).  I will backport to the
other affected branches in the near future.

Regards

	Thomas

2017-05-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * frontend-passes.c (matmul_lhs_realloc):  Correct
         allocation size for case A1B2.

2017-05-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

         * gfortran.dg/matmul_bounds_12.f90:  New test.
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