[Bug fortran/126386] matmul in combination with multiplication and transpose fails to correctly reallocate result array

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=126386

--- Comment #6 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-15 branch has been updated by Thomas Koenig
<[email protected]>:

https://gcc.gnu.org/g:3390b0e262c7f26a440638a78e40866242067cf5

commit r15-11421-g3390b0e262c7f26a440638a78e40866242067cf5
Author: Thomas Koenig <[email protected]>
Date:   Sun Jul 26 13:41:32 2026 +0200

    Fix size calculation for reallocation for matmul of rank 2 a and rank 1 b.

    This is a rather simple one-character (well, two-bit) fix for th
    calculation of the size of the reallocation of the LHS if that
    is allocatable.

    gcc/fortran/ChangeLog:

            PR fortran/126386
            * frontend-passes.cc (matmul_lhs_realloc):  Fix size calculation of
            A2B1 case.

    gcc/testsuite/ChangeLog:

            PR fortran/126386
            * gfortran.dg/inline_matmul_28.f90: New test.

    (cherry picked from commit 4d855f3af5b18e539585d1d4832470e500323c12)