[patch, fortran] Fix PR 36931, more array dependencies

[Thomas Koenig]

Hello world,

here a few more temporary eliminations, for code like

  a = f() + b

After unsuccessfully trying to understand how to do this in trans-*,
I used a transformation of the front end trees, in the front end
optimization pass.

Regression-tested.  OK for trunk?

	Thomas

2010-09-04  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/36931
	* frontend-passes.c (optimize_binop_array_assignment):  New
	function.
	(optimize_assignment):  Call it.

2010-09-04  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/36931
	* gfortran.dg/dependency_35.f90:  New test.

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