[Patch, Fortran] Some fixes for polymorphic coarrays

[Tobias Burnus]

Two small fixes:

a) There was an ICE when simplifying "THIS_IMAGE(caf)" (for 
-fcoarray=single); solution: Simply use internally lcobound(), which is 
identically (for a single image).

b) There was an segfault of the compiled program when running 
"this_image(caf)" where "caf" is a corank-1 coarray. Calculating the 
extend of an assumed size array should be avoided ...

The patch has been build and regtested on x86-64-linux.
OK for the trunk?

Tobias

PS: There are still some other issues with polymorphic coarrays, see 
"Next steps" in 
http://users.physik.fu-berlin.de/~tburnus/coarray/README.txt for a list. 
For instance, there is an ICE if one tries to explicitly deallocate 
scalar polymorphic coarrays.
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