Migrate instance of deprecated maps in HCheckMaps.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index b9eab45293befcf143e0bfa77abc8f347cc459b9..a4d01bbb3bc0f10cb0d9fe35d23f32f6a35f678d 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -2877,6 +2877,7 @@ class HCheckMaps: public HTemplateInstruction<2> {
     HCheckMaps* check_map = new(zone) HCheckMaps(value, zone, typecheck);
     for (int i = 0; i < maps->length(); i++) {
       check_map->map_set_.Add(maps->at(i), zone);
+      check_map->has_migration_target_ |= maps->at(i)->is_migration_target();
     }
     check_map->map_set_.Sort();
     return check_map;
@@ -2895,6 +2896,10 @@ class HCheckMaps: public HTemplateInstruction<2> {
   HValue* value() { return OperandAt(0); }
   SmallMapList* map_set() { return &map_set_; }
 
+  bool has_migration_target() {
+    return has_migration_target_;
+  }
+
   virtual void FinalizeUniqueValueId();
 
   DECLARE_CONCRETE_INSTRUCTION(CheckMaps)
@@ -2919,7 +2924,7 @@ class HCheckMaps: public HTemplateInstruction<2> {
   // Clients should use one of the static New* methods above.
   HCheckMaps(HValue* value, Zone *zone, HValue* typecheck)
       : HTemplateInstruction<2>(value->type()),
-        omit_(false), map_unique_ids_(0, zone) {
+        omit_(false), has_migration_target_(false), map_unique_ids_(0, zone) {
     SetOperandAt(0, value);
     // Use the object value for the dependency if NULL is passed.
     // TODO(titzer): do GVN flags already express this dependency?
@@ -2941,6 +2946,7 @@ class HCheckMaps: public HTemplateInstruction<2> {
   }
 
   bool omit_;
+  bool has_migration_target_;
   SmallMapList map_set_;
   ZoneList<UniqueValueId> map_unique_ids_;
 };