[Reg 4.6 -> 4.7] CDB cannot resolve enums

The value of simple enums can be resolved by CDB debugger in Creator 4.6, but not in 4.7.

Can be reproduced by copying the following snippet into a Qt Widgets project:

enum E { a = 0, b, c };

E e = c;
E f = e;

Note that MinGW works fine in 4.7 also.