Revert r374006: Reland 'Add VFS support for sanitizers' blacklist'

Also revert follow-up changes to the test.
Reason: the patch breaks our internal clang-tidy integration.

It's also unclear why we should use getRealPath instead of plumbing the
VFS to SanitizerBlacklist, see original commit thread of cfe-commits for
a discussion.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@374151 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed