[patch, Fortran] Fix for PR 61999, dot_product simplification

[Thomas Koenig]

Hello world,

the attached patch fixes the regression by converting the arguments
to dot_product to the proper types.

Regression-tested on x86_64-unknown-linux-gnu.

OK for all affected branches (trunk, 4.9 and 4.8)?

	Thomas

2014-08-10  Thomas Koenig  <tkoenig@gcc.gnu.org>

        PR fortran/61999
        * simplify.c (gfc_simplify_dot_product): Convert types of
        vectors before calculating the result.

2014-08-10  Thomas Koenig  <tkoenig@gcc.gnu.org>

        PR fortran/61999
        * gfortran.dg/dot_product_3.f90:  New test case.
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