Fix field type handling in load elimination.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index b60ad50408cf2444f68e62c7daa77a3c96111052..9a9688bde5ce97c7f3236f61b25a7906c7a7c84f 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -5197,13 +5197,13 @@ 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();
     __ CompareMapAndBranch(map_reg, map, &success, eq, &success);
   }
-  Handle<Map> map = map_set.at(map_set.size() - 1).handle();
+  Handle<Map> map = map_set->at(map_set->size() - 1).handle();
   // Do the CompareMap() directly within the Branch() and DeoptimizeIf().
   if (instr->hydrogen()->has_migration_target()) {
     __ Branch(deferred->entry(), ne, map_reg, Operand(map));