THRIFT-868. Make const values work properly with typdefs

Just requires calling get_true_type in the right spot.  Because "the
right spot" is under src/parse, get_true_type had to be moed from
t_generator to t_type.

git-svn-id: https://svn.apache.org/repos/asf/incubator/thrift/trunk@1004703 13f79535-47bb-0310-9956-ffa450edef68
4 files changed