[patches,fortran] Add POINTER INTENT(*) support (PR29624)

[Tobias Burnus]

:ADDPATCH fortran:

The standard can be found at
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=29624#c0

In a nutshell: With intent(in) the pointer dummy argument's association
shall not be changed, the target may.

Thanks to Tobias S. for pointing out that I was looking at the wrong
thing in terms of attributes.

Quick remark to compound structures:
- If the last subobject is a pointer & its association is changed, I
check whether somewhere higher up in the hierarchy is already a pointer,
because then the subobject is a target of that one. => Modification allowed.
- If the last subobject is a pointer & its value target value is changed
=> Modification always allowed
- If the last subobject is a nonpointer: Check whether somewhere higher
up in the hierarchy is already a pointer, because then the subobject is
a target of that one. => Modification allowed.


Regression tested on x86_64-unknown-linux-gnu.

Tobias
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