Add support for member data pointer type.
Add support for member data pointer type.

Given:

class A {
private:
   int fInt;
};

We need to support storing the return value of
a function like this:

int A::*
f()
{
   return &A::fInt;
}

marsupial/cling,perovic/cling,karies/cling,karies/cling,root-mirror/cling,karies/cling,karies/cling,root-mirror/cling,perovic/cling,karies/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,perovic/cling,marsupial/cling,marsupial/cling,root-mirror/cling,marsupial/cling,perovic/cling,perovic/cling,karies/cling,marsupial/cling,marsupial/cling