test: add new test of indirect type references
test: add new test of indirect type references

Similar to bug190, but without recursive reference.  Crashed
gccgo.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/5672053
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go