Various cleanups in check elimination.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
diff --git a/src/x64/lithium-codegen-x64.cc b/src/x64/lithium-codegen-x64.cc
index bfeffd3f15f39cf9e6a7f7b7570d712f0e16c00f..b3a1c30f37fa200338789f9737d9b38401558d79 100644
--- a/src/x64/lithium-codegen-x64.cc
+++ b/src/x64/lithium-codegen-x64.cc
@@ -5025,15 +5025,15 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
     __ bind(deferred->check_maps());
   }
 
-  const UniqueSet<Map>* map_set = instr->hydrogen()->map_set();
+  const UniqueSet<Map>* maps = instr->hydrogen()->maps();
   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 < maps->size() - 1; i++) {
+    Handle<Map> map = maps->at(i).handle();
     __ CompareMap(reg, map);
     __ j(equal, &success, Label::kNear);
   }
 
-  Handle<Map> map = map_set->at(map_set->size() - 1).handle();
+  Handle<Map> map = maps->at(maps->size() - 1).handle();
   __ CompareMap(reg, map);
   if (instr->hydrogen()->has_migration_target()) {
     __ j(not_equal, deferred->entry());