[SystemZ]  Update test case (NFC)

test/CodeGen/SystemZ/vec-trunc-to-i1.ll was marked as a temporary
FAIL when it was previously updated when it needed one more COPY.
This was however wrong, since the loop body had been reduced
significantly, and it was actually an improvement.

Review: Ulrich Weigand.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@324060 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed