Use Unique<Map> in CompareMap.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index 5bb7f484b5a75a50eef40cfd3a4b0f2ffb6fccb1..f36282f827e47ad45f76de9c883f1bd5d67ab10a 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -1392,7 +1392,7 @@ class HCompareMap V8_FINAL : public HUnaryControlInstruction {
 
   virtual void PrintDataTo(StringStream* stream) V8_OVERRIDE;
 
-  Handle<Map> map() const { return map_; }
+  Unique<Map> map() const { return map_; }
 
   virtual Representation RequiredInputRepresentation(int index) V8_OVERRIDE {
     return Representation::Tagged();
@@ -1408,11 +1408,12 @@ class HCompareMap V8_FINAL : public HUnaryControlInstruction {
               Handle<Map> map,
               HBasicBlock* true_target = NULL,
               HBasicBlock* false_target = NULL)
-      : HUnaryControlInstruction(value, true_target, false_target), map_(map) {
+      : HUnaryControlInstruction(value, true_target, false_target),
+        map_(Unique<Map>(map)) {
     ASSERT(!map.is_null());
   }
 
-  Handle<Map> map_;
+  Unique<Map> map_;
 };