test: add test of calling recover in a varargs function
test: add test of calling recover in a varargs function

gccgo did not handle this correctly.

R=golang-dev, rsc
CC=golang-dev
http://codereview.appspot.com/5714050
abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go,abustany/go