Don't add code dependencies eagerly for HCheckMaps.

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 d95f0c36077eb9637bce590e3a556ce486f473e9..e8593d98e33b5368b391ef97f0136ac263394c59 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -5164,7 +5164,14 @@ 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();
   ASSERT(input->IsRegister());
@@ -5172,7 +5179,7 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   __ lw(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());
   }
@@ -5185,7 +5192,7 @@ void LCodeGen::DoCheckMaps(LCheckMaps* instr) {
   }
   Handle<Map> map = maps->at(maps->size() - 1).handle();
   // Do the CompareMap() directly within the Branch() and DeoptimizeIf().
-  if (instr->hydrogen()->has_migration_target()) {
+  if (instr->hydrogen()->HasMigrationTarget()) {
     __ Branch(deferred->entry(), ne, map_reg, Operand(map));
   } else {
     DeoptimizeIf(ne, instr->environment(), map_reg, Operand(map));