Don't add code dependencies eagerly for HCheckMaps.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 5b2a5f5ec1048b662522ba584aa637f3f969162a..0c10a65c217f7841fa70c5ba780ec84bc633a787 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1976,15 +1976,12 @@ LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
 
 
 LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
-  LOperand* value = NULL;
-  if (!instr->CanOmitMapChecks()) {
-    value = UseRegisterAtStart(instr->value());
-    if (instr->has_migration_target()) info()->MarkAsDeferredCalling();
-  }
-  LInstruction* result = new(zone()) LCheckMaps(value);
-  if (!instr->CanOmitMapChecks()) {
-    result = AssignEnvironment(result);
-    if (instr->has_migration_target()) result = AssignPointerMap(result);
+  if (instr->IsStabilityCheck()) return new(zone()) LCheckMaps;
+  LOperand* value = UseRegisterAtStart(instr->value());
+  LInstruction* result = AssignEnvironment(new(zone()) LCheckMaps(value));
+  if (instr->HasMigrationTarget()) {
+    info()->MarkAsDeferredCalling();
+    result = AssignPointerMap(result);
   }
   return result;
 }