[patch, fortran] PR 40628, front-end optimization pass

[Thomas Koenig]

Hello world,

finally, here's the first attempt at a front-end optimization pass.
Right now, it fixes PR 40626 and optimizes comparisons between variables
(which only really is relevant for character comparisons).  Many more
things could (and should) be added over time.

This now passes regression-testing for trunk.

OK for trunk?

	Thomas

2010-0717  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* Make-lang.in:  Add fortran/optimize.o.
	* gfortran.h:  Add prototype for gfc_optimize_namespace.
	* trans-decl.c (gfc_generate_function_code):  If optimizing,
	call gfc_optimize_namespace.
	* optimize.c:  New file.

2010-0717  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* trim_optimize_1.f90:  New test.
	* character_comparision_1.f90:  New test.

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