compiler/cpp/src/generate/t_go_generator: Fix up the Union methods
compiler/cpp/src/generate/t_go_generator: Fix up the Union methods

upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift,upfluence/thrift