[ubsan] Add e2e test for -fsanitize=nullability

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@298117 91177308-0d34-0410-b5e6-96231b3b80d8
(cherry picked from commit b0440701995f9d09ff87b210856b5e426ad073eb)
1 file changed