gfc_build_addr_expr vs. build_fold_addr_expr{,_with_type}

[FX Coudert]

> The only downside I see with this type of patch is that backporting
> fixes from trunk to 4.1 will be more difficult.  With only a small
> group of active gfortran hackers, this may place 4.1 into position
> of low maintenance. 

Unless I am mistaken, this patch doesn't touch anything outside the 
fortran/ front-end, so I think we can consider backporting it to 4.1.

$ diff gcc/gcc/fortran gcc-4.1/gcc/fortran|wc -l
743
$ diff gcc/libgfortran gcc-4.1/libgfortran|wc -l
1747

The last number falls down to 484 if we don't count the regenerated files.

FX