[Patch,Fortran] PR39427/37829 - implement F2003's constructors

[Tobias Burnus]

Paul Richard Thomas wrote:
> I think that a comment is in order every time that you exploit the
> upper/lower case distinction.
>
> OK for trunk.

Thanks for the review and thanks for the comment.

I have now added some comments to symbol.c's gfc_undo_symbols, decl.c's 
gfc_match_decl_type_spec and gfc_match_import, and to module.c's 
dt_lower_string and dt_upper_string.

Since the changes were that minor and the patch is that large, I have 
not included the committed patch here. The commit was Rev. 181425. See 
also http://gcc.gnu.org/viewcvs?root=gcc&view=rev&rev=181425

Tobias