[FaultMaps] Fix test case.

implicit-null-check-negative.ll had a missing 2>&1.  Fix this, and
remove an incorrect test case that this exposes.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240998 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed