Benjamin Kramer 0b68b758bb DAGCombine: visitXOR can replace a node without returning it, bail out in that case.
Fixes the crash reported in PR15608.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@178429 91177308-0d34-0410-b5e6-96231b3b80d8
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