Use the property load IC for accessing the array length.

src/arm/lithium-codegen-arm.cc

Index: src/arm/lithium-codegen-arm.cc
diff --git a/src/arm/lithium-codegen-arm.cc b/src/arm/lithium-codegen-arm.cc
index 7615134ec08af7473a2851d7db3b7c9603218d4b..a38fc7d9cfd3b68e24a80b1dc19cfa6a077ae0a0 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -4886,11 +4886,12 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   SmallMapList* map_set = instr->hydrogen()->map_set();
   for (int i = 0; i < map_set->length() - 1; i++) {
     Handle<Map> map = map_set->at(i);
-    __ CompareMap(reg, scratch, map, &success, REQUIRE_EXACT_MAP);
+    __ CompareMap(reg, scratch, map, &success, instr->hydrogen()->mode());
     __ b(eq, &success);
   }
   Handle<Map> map = map_set->last();
-  DoCheckMapCommon(reg, scratch, map, REQUIRE_EXACT_MAP, instr->environment());
+  DoCheckMapCommon(reg, scratch, map, instr->hydrogen()->mode(),
+                   instr->environment());
   __ bind(&success);
 }