[patch, fortran] Further dependency improvements

[Thomas Koenig]

Hi Daniel,

> I think that we introduced CLASS_PURE / CLASS_IMPURE for intrinsics 
> lately -- and would suggest to use that information instead of 
> duplicating the list here.  Although I do not completely remember 
> whether that is already set correctly or not.

Excellent point (I had completely missed this).  Upated patch is
attached.

Currently regtesting.  OK for trunk if this passes?

	Thomas

2010-08-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/45159
	* dependency.c (gfc_deb_compare_expr):  Compare equal for equal
	arglists for pure user functions, or for those intrinsic
	functions which are also pure.

2010-08-28  Thomas Koenig  <tkoenig@gcc.gnu.org>

	PR fortran/45159
	* gfortran.dg/dependency_34.f90:  New test.


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