Fix field type handling in load elimination.

src/arm64/lithium-codegen-arm64.cc

Index: src/arm64/lithium-codegen-arm64.cc
diff --git a/src/arm64/lithium-codegen-arm64.cc b/src/arm64/lithium-codegen-arm64.cc
index 292c7a0f287fc9bd904811b5f9c6673a9a6e392f..a59120c76daf26878664091b3352ce89483e9a06 100644
--- a/src/arm64/lithium-codegen-arm64.cc
+++ b/src/arm64/lithium-codegen-arm64.cc
@@ -2135,14 +2135,14 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
     __ Bind(deferred->check_maps());
   }
 
-  UniqueSet<Map> map_set = instr->hydrogen()->map_set();
+  const UniqueSet<Map>* map_set = instr->hydrogen()->map_set();
   Label success;
-  for (int i = 0; i < map_set.size() - 1; i++) {
-    Handle<Map> map = map_set.at(i).handle();
+  for (int i = 0; i < map_set->size() - 1; i++) {
+    Handle<Map> map = map_set->at(i).handle();
     __ CompareMap(map_reg, map);
     __ B(eq, &success);
   }
-  Handle<Map> map = map_set.at(map_set.size() - 1).handle();
+  Handle<Map> map = map_set->at(map_set->size() - 1).handle();
   __ CompareMap(map_reg, map);
 
   // We didn't match a map.