[patch, fortran] Front-end optimizations for contained namespaces

[Thomas Koenig]

Hello world,

this patch makes sure that front-end optimizations are also applied to
contained procedures.

Regression-tested.  OK for trunk?

	Thomas

2010-09-03  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* dump_parse_tree (gfc_run_passes):  Call optimize_namespace
	instead of optimize_code.
	(optimize_namespace):  New function.
	
2010-09-03  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* gfortran.dg/trim_optimize_2.f90:  New test.

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