Disable and XFAIL a test that never worked

-verify was simply ignored by the driver.

This commit fixes the RUN line and XFAILs the test, unblocking changes to ban
use of the driver in Sema tests and avoid problems like this.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@199347 91177308-0d34-0410-b5e6-96231b3b80d8

test/Sema/warn-thread-safety-analysis.c

-// RUN: %clang -fsyntax-only -verify -Wthread-safety -Wthread-safety-beta -fcxx-exceptions %s
+// RUN: %clang_cc1 -fsyntax-only -verify -Wthread-safety -Wthread-safety-beta -fcxx-exceptions %s
+// FIXME: This test never worked due to a broken RUN line.
+// XFAIL: *
 
 #define LOCKABLE            __attribute__ ((lockable))
 #define SCOPED_LOCKABLE     __attribute__ ((scoped_lockable))