[llvm] [InstCombine] Fold `trunc nuw (x xor y) to i1` to `x != y` (PR #90408)

[Yingwei Zheng via llvm-commits]

================
@@ -770,6 +770,13 @@ Instruction *InstCombinerImpl::visitTrunc(TruncInst &Trunc) {
         return new ICmpInst(ICmpInst::Predicate::ICMP_EQ, X, Zero);
       }
     }
+
+    if (Trunc.hasNoUnsignedWrap()) {
+      Value *X, *Y;
+      if (match(Src, m_Xor(m_Value(X), m_Value(Y)))) {
+        return new ICmpInst(ICmpInst::ICMP_NE, X, Y);
+      }
----------------
dtcxzyw wrote:

```suggestion
      if (match(Src, m_Xor(m_Value(X), m_Value(Y))))
        return new ICmpInst(ICmpInst::ICMP_NE, X, Y);
```

https://github.com/llvm/llvm-project/pull/90408