[patch, fortran, 4.9] Dependency and string length calculation improvements

[Thomas Koenig]

Dominique,

> Your test gfortran.dg/dependency_40.f90 does not have depedencies and
> does not create a temporary (assuming that "-Warray-temporaries" does
> not miss any) with/without your patch and with gcc4.6, 4.7, and 4.8.
> 4.5 gives a warning.

You are quite correct, the test case didn't really test a lot.  The old
algorithms were better than I thought ;-)

Here is a corrected test case, which also has a correct file name
(which does not clobber an old test).

Thanks for catching this!

	Thomas


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