[patch, fortran, 4.9] Improve efficiency of array constructor operators

[Thomas Koenig]

Hello world,

this updated patch fixes a regression in my previous patch,
with a test case for that regression also attached.

Regression-tested.

OK for trunk?

	Thomas

2013-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/55806
         * frontend-passes.c (optimize_code):  Keep track of
         current code to make code insertion possible.
         (combine_array_constructor):  New function.
         (optimize_op):  Call it.

2013-03-24  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/55806
         * gfortran.dg/array_constructor_43.f90:  New test.
         * gfortran.dg/random_seed_3.f90:  New test.

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