[wasm] Added I64Xor to the Int64Lowering.

src/compiler/int64-lowering.cc

Index: src/compiler/int64-lowering.cc
diff --git a/src/compiler/int64-lowering.cc b/src/compiler/int64-lowering.cc
index 48f461da0e2fbb679ee00cbf274207d0e1b726db..1b0ead5049c689dd61f20402548ca22d3065b387 100644
--- a/src/compiler/int64-lowering.cc
+++ b/src/compiler/int64-lowering.cc
@@ -274,6 +274,21 @@ void Int64Lowering::LowerNode(Node* node) {
     }
 
     // kExprI64Xor:
+    case IrOpcode::kWord64Xor: {
+      DCHECK(node->InputCount() == 2);
+      Node* left = node->InputAt(0);
+      Node* right = node->InputAt(1);
+
+      Node* low_node =
+          graph()->NewNode(machine()->Word32Xor(), GetReplacementLow(left),
+                           GetReplacementLow(right));
+      Node* high_node =
+          graph()->NewNode(machine()->Word32Xor(), GetReplacementHigh(left),
+                           GetReplacementHigh(right));
+      ReplaceNode(node, low_node, high_node);
+      break;
+    }
+
     // kExprI64Shl:
     // kExprI64ShrU:
     // kExprI64ShrS: