Fix a mistyped function name in the test expectation

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@2031 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5
Add an __asan_{,un}poison_memory_region test

git-svn-id: http://address-sanitizer.googlecode.com/svn/trunk@2032 3c3640eb-14a6-2bb8-0b94-e9e73afe33f5