[patch, fortran] Make front end walker more complete

[Thomas Koenig]

Hello world,

here's a patch to handle more cases in the front end, pretty
self-explanatory.

Regression-tested.

OK for trunk?

2010-09-17  Thomas Koenig  <tkoenig@gcc.gnu.org>

	* frontend-passes.c (gfc_expr_walker):  Handle
	constructors and references.

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