[wasm] Break a cycle with a loop node in the int64-lowering.

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 62523ca45c62a25defaec14585169e77aa184bd7..2637977f08d481a2a8cd2dec6d5987432e839367 100644
--- a/src/compiler/int64-lowering.cc
+++ b/src/compiler/int64-lowering.cc
@@ -61,7 +61,8 @@ void Int64Lowering::LowerGraph() {
           // that they are processed after all other nodes.
           PreparePhiReplacement(input);
           stack_.push_front({input, 0});
-        } else if (input->opcode() == IrOpcode::kEffectPhi) {
+        } else if (input->opcode() == IrOpcode::kEffectPhi ||
+                   input->opcode() == IrOpcode::kLoop) {
           stack_.push_front({input, 0});
         } else {
           stack_.push_back({input, 0});