[Patch, Fortran] Coarrays: Add/fix check for no coarrays as result value

[Tobias Burnus]

This patch fixes the result check for coarrays / variables with coarray 
subcomponents. It was working with a separate RESULT() variable - but 
not if the function name was the result variable.

Build and regtested on x86-64-linux.
OK for the trunk?

Tobias
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