[mips64][turbofan] LoadImmutable should be eligible as memory operand

Port: cc0d6a85

Bug: v8:11510
Change-Id: I4b2c0fa90e14609bb22de36b71e37eddc6f46af5
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2845085
Auto-Submit: Liu yu <liuyu@loongson.cn>
Reviewed-by: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Commit-Queue: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#74119}

src/compiler/backend/mips64/instruction-selector-mips64.cc

@@ -1454,7 +1454,8 @@ void InstructionSelector::VisitBitcastWord32ToWord64(Node* node) {
 
 void InstructionSelector::VisitChangeInt32ToInt64(Node* node) {
   Node* value = node->InputAt(0);
-  if ((value->opcode() == IrOpcode::kLoad || IrOpcode::kLoadImmutable) &&
+  if ((value->opcode() == IrOpcode::kLoad ||
+       value->opcode() == IrOpcode::kLoadImmutable) &&
       CanCover(node, value)) {
     // Generate sign-extending load.
     LoadRepresentation load_rep = LoadRepresentationOf(value->op());