[asan] Fix a flaky test.

This test has a chance to hit some other random allocation
and get neither heap overflow nor SEGV.

Relax test condition to only check that there is no internal CHECK failure.


git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@217769 91177308-0d34-0410-b5e6-96231b3b80d8