DAGCombiner: Generate a correct constant for vector types when folding (xor (and)) into (and (not)).

PR15948.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181597 91177308-0d34-0410-b5e6-96231b3b80d8
XFAILing this test on Win32 to unbreak the build bots.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@181600 91177308-0d34-0410-b5e6-96231b3b80d8