[patch, fortran] Check bounds for matrix-vector multiplication

[Thomas Koenig]

Hello world,

the attached patch also performs a check for matrix-vector
multiplication.  I found it by poking around the source while
looking to do some improvements, which should be coming up
shortly once this is out of the way.

Regression-tested.  OK for trunk?

Regards

	Thomas

2017-05-01  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/37131
         * frontend-passes.c (inline_matmul_assign): Also check bounds
         for allocatable lhs and matrix-vector-multiplication.

2017-05-01  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/37131
         * gfortran.dg/matmul_bounds_11.f90:  New test.
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