[wasm] Do the default int64-lowering for all non-i64 stores.

src/compiler/int64-lowering.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/compiler/int64-lowering.h"
 #include "src/compiler/common-operator.h"
 #include "src/compiler/diamond.h"
 #include "src/compiler/graph.h"
 #include "src/compiler/linkage.h"
 #include "src/compiler/machine-operator.h"
@@ skipping 219 matching lines @@
         } else {
           high_node = graph()->NewNode(store_op, base, index_high,
                                        GetReplacementHigh(value));
         }
 
         node->ReplaceInput(1, index_low);
         node->ReplaceInput(2, GetReplacementLow(value));
         NodeProperties::ChangeOp(node, store_op);
         ReplaceNode(node, node, high_node);
       } else {
-        if (HasReplacementLow(node->InputAt(2))) {
-          node->ReplaceInput(2, GetReplacementLow(node->InputAt(2)));
-        }
+        DefaultLowering(node);
       }
       break;
     }
     case IrOpcode::kStart: {
       int parameter_count = GetParameterCountAfterLowering(signature());
       // Only exchange the node if the parameter count actually changed.
       if (parameter_count != static_cast<int>(signature()->parameter_count())) {
         int delta =
             parameter_count - static_cast<int>(signature()->parameter_count());
         int new_output_count = node->op()->ValueOutputCount() + delta;
@@ skipping 639 matching lines @@
                     common()->Phi(MachineRepresentation::kWord32, value_count),
                     value_count + 1, inputs_low, false),
                 graph()->NewNode(
                     common()->Phi(MachineRepresentation::kWord32, value_count),
                     value_count + 1, inputs_high, false));
   }
 }
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8