[patch, fortran] Some more TRIM optimizations

[Thomas Koenig]

I wrote:

> Hello world,
>
> the attached patch extends removing trailing TRIMs in assignments for
> cases like a // trim(b). Regression-tested. OK for trunk?
>
> Thomas

This time with the test case corrected (cleanup of the *.original file)
and a more meaningful Subject line.

OK?

	Thomas

2011-05-06  Thomas König  <tkoenig@gcc.gnu.org>

         * frontend-passes.c (optimize_assignment): Follow chains
         of concatenation operators to the end for removing trailing
         TRIMS for assignments.

2011-05-06  Thomas König  <tkoenig@gcc.gnu.org>

         * gfortran.dg/trim_optimize_7.f90:  New test.
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