Use the property load IC for accessing the array length.

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 f79208ea25a9bb27b88468182248ea9f1047e8d1..44e8a715b1d55dfd4ff54ad7c8a4b3f30a64efbc 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -4598,10 +4598,11 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   for (int i = 0; i < map_set->length() - 1; i++) {
     Handle<Map> map = map_set->at(i);
     __ CompareMapAndBranch(
-        reg, scratch, map, &success, eq, &success, REQUIRE_EXACT_MAP);
+        reg, scratch, map, &success, eq, &success, instr->hydrogen()->mode());
   }
   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);
 }