Update another xor->or transform

Author: topperc

llvm/lib/Transforms/InstCombine/InstCombineAndOrXor.cpp

@@ -4462,8 +4462,11 @@ Instruction *InstCombinerImpl::visitXor(BinaryOperator &I) {
   Value *Op0 = I.getOperand(0), *Op1 = I.getOperand(1);
   Value *M;
   if (match(&I, m_c_Xor(m_c_And(m_Not(m_Value(M)), m_Value()),
-                        m_c_And(m_Deferred(M), m_Value()))))
-    return BinaryOperator::CreateOr(Op0, Op1);
+                        m_c_And(m_Deferred(M), m_Value())))) {
+    auto *Or = BinaryOperator::CreateOr(Op0, Op1);
+    cast<PossiblyDisjointInst>(Or)->setIsDisjoint(true);
+    return Or;
+  }
 
   if (Instruction *Xor = visitMaskedMerge(I, Builder))
     return Xor;