[PATCH, Fortran, cosmetics] Use convenience functions and constants

[Andre Vehreschild]

Hi all,

during more hacking on the allocatable components in derived type coarrays, I
encountered the improvable code fragments in the patch attached.

Bootstraps and regtests ok on x86_64-linux/F23. Ok for trunk?

Regards,
	Andre

PS: The patch that motivated these changes follows as soon as its regtesting
has finished.
-- 
Andre Vehreschild * Email: vehre ad gmx dot de 
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