Enable sanitizer_common tests on NetBSD

Summary:
NetBSD can handle asan, ubsan, msan, tsan tests
on 64-bit and when applicable 32-bit X86 OS.

Sponsored by <The NetBSD Foundation>

Reviewers: joerg, vitalybuka

Subscribers: srhines, llvm-commits, kubamracek, mgorny, #sanitizers

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D42236

llvm-svn: 322842