[Patch, Fortran] PR18918 - small coarray fixes

[Tobias Burnus]

Another two simple coarray fixes:

(a) when reading a module, the cotype was not set. The consequence was 
that one could not use associate alloctable coarray module variables

(b) The coindexed check was overeager and also rejected "alloctate( 
x%b(3)[*])" claiming that the expression is coindexed.

Attached patch has been built and regtested on x86-64-linux.
Okay for the trunk?

Tobias
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