[patch, fortran] PR 47065 - some more trim optimizations

[Thomas Koenig]

Hello world,

the attached patch does the trim optimizations when there are
references, except substring references.  This was made possible by
Paul's fix to PR 47348.  Regression-tested.

OK for trunk?  Or should I rather wait until 4.6 is released?

2011-02-20  Thomas Koenig  <tkoenig@gcc.gnu.org>

        PR fortran/47065
        * frontend-passes (check_impure_function): New function.
        * optimize_trim: Also follow references, except when they are
        substring references.  Don't replace calls to trim with substrings
        if the substring indices contain impure functions.

2011-02-20  Thomas Koenig  <tkoenig@gcc.gnu.org>

        PR fortran/47065
        * gfortran.dg/trim_optimize_5.f90:  New test.
        * gfortran.dg/trim_optimize_6.f90:  New test.
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