C++: Better resolution for typedef when resolving expr.

Example:
struct Bar { int m; };
typedef Bar *pBar;
pBar b;
b-> // completes correctly now

Change-Id: I97cc67579b955fe47c68ab6c35be9a054b6d1be9
Done-by: ckamm
Reviewed-by: Roberto Raggi <roberto.raggi@nokia.com>