Don't add code dependencies eagerly for HCheckMaps.

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 3eda96242f23f67f1d55e5dd9647593468489567..19b34dada49f1d762b259e8a6632608751eb40f5 100644
--- a/src/arm/lithium-codegen-arm.cc
+++ b/src/arm/lithium-codegen-arm.cc
@@ -5140,7 +5140,14 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
     Register object_;
   };
 
-  if (instr->hydrogen()->CanOmitMapChecks()) return;
+  if (instr->hydrogen()->IsStabilityCheck()) {
+    const UniqueSet<Map>* maps = instr->hydrogen()->maps();
+    for (int i = 0; i < maps->size(); ++i) {
+      AddStabilityDependency(maps->at(i).handle());
+    }
+    return;
+  }
+
   Register map_reg = scratch0();
 
   LOperand* input = instr->value();
@@ -5150,7 +5157,7 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   __ ldr(map_reg, FieldMemOperand(reg, HeapObject::kMapOffset));
 
   DeferredCheckMaps* deferred = NULL;
-  if (instr->hydrogen()->has_migration_target()) {
+  if (instr->hydrogen()->HasMigrationTarget()) {
     deferred = new(zone()) DeferredCheckMaps(this, instr, reg);
     __ bind(deferred->check_maps());
   }
@@ -5165,7 +5172,7 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
 
   Handle<Map> map = maps->at(maps->size() - 1).handle();
   __ CompareMap(map_reg, map, &success);
-  if (instr->hydrogen()->has_migration_target()) {
+  if (instr->hydrogen()->HasMigrationTarget()) {
     __ b(ne, deferred->entry());
   } else {
     DeoptimizeIf(ne, instr->environment());