[wasm] Check for replacements of IndexNodes in 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 2637977f08d481a2a8cd2dec6d5987432e839367..ad6e64e0c55450051769b83352dc656c1edb96e4 100644
--- a/src/compiler/int64-lowering.cc
+++ b/src/compiler/int64-lowering.cc
@@ -105,6 +105,9 @@ static int GetReturnCountAfterLowering(
 
 void Int64Lowering::GetIndexNodes(Node* index, Node*& index_low,
                                   Node*& index_high) {
+  if (HasReplacementLow(index)) {
+    index = GetReplacementLow(index);
+  }
 #if defined(V8_TARGET_LITTLE_ENDIAN)
   index_low = index;
   index_high = graph()->NewNode(machine()->Int32Add(), index,