Reland deprecation of HAllocateObject in favor of HAllocate.

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index cb2225dcf69b973a1ba07c3c71c879212bd23b20..27c517aa1a5be38b03e3ec186532dea8da7aeebb 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -66,7 +66,6 @@ class LChunkBuilder;
   V(AccessArgumentsAt)                         \
   V(Add)                                       \
   V(Allocate)                                  \
-  V(AllocateObject)                            \
   V(ApplyArguments)                            \
   V(ArgumentsElements)                         \
   V(ArgumentsLength)                           \
@@ -4952,50 +4951,6 @@ class HLoadGlobalGeneric: public HTemplateInstruction<2> {
 };
 
 
-class HAllocateObject: public HTemplateInstruction<1> {
- public:
-  HAllocateObject(HValue* context, Handle<JSFunction> constructor)
-      : constructor_(constructor) {
-    SetOperandAt(0, context);
-    set_representation(Representation::Tagged());
-    SetGVNFlag(kChangesNewSpacePromotion);
-    constructor_initial_map_ = constructor->has_initial_map()
-        ? Handle<Map>(constructor->initial_map())
-        : Handle<Map>::null();
-    // If slack tracking finished, the instance size and property counts
-    // remain unchanged so that we can allocate memory for the object.
-    ASSERT(!constructor->shared()->IsInobjectSlackTrackingInProgress());
-  }
-
-  // Maximum instance size for which allocations will be inlined.
-  static const int kMaxSize = 64 * kPointerSize;
-
-  HValue* context() { return OperandAt(0); }
-  Handle<JSFunction> constructor() { return constructor_; }
-  Handle<Map> constructor_initial_map() { return constructor_initial_map_; }
-
-  virtual Representation RequiredInputRepresentation(int index) {
-    return Representation::Tagged();
-  }
-
-  virtual Handle<Map> GetMonomorphicJSObjectMap() {
-    ASSERT(!constructor_initial_map_.is_null());
-    return constructor_initial_map_;
-  }
-
-  virtual HType CalculateInferredType();
-
-  DECLARE_CONCRETE_INSTRUCTION(AllocateObject)
-
- private:
-  // TODO(svenpanne) Might be safe, but leave it out until we know for sure.
-  //  virtual bool IsDeletable() const { return true; }
-
-  Handle<JSFunction> constructor_;
-  Handle<Map> constructor_initial_map_;
-};
-
-
 class HAllocate: public HTemplateInstruction<2> {
  public:
   enum Flags {
@@ -5016,6 +4971,9 @@ class HAllocate: public HTemplateInstruction<2> {
     SetGVNFlag(kDependsOnNewSpacePromotion);
   }
 
+  // Maximum instance size for which allocations will be inlined.
+  static const int kMaxInlineSize = 64 * kPointerSize;
+
   static Flags DefaultFlags() {
     return CAN_ALLOCATE_IN_NEW_SPACE;
   }
@@ -5041,6 +4999,14 @@ class HAllocate: public HTemplateInstruction<2> {
     }
   }
 
+  virtual Handle<Map> GetMonomorphicJSObjectMap() {
+    return known_initial_map_;
+  }
+
+  void set_known_initial_map(Handle<Map> known_initial_map) {
+    known_initial_map_ = known_initial_map;
+  }
+
   virtual HType CalculateInferredType();
 
   bool CanAllocateInNewSpace() const {
@@ -5082,6 +5048,7 @@ class HAllocate: public HTemplateInstruction<2> {
  private:
   HType type_;
   Flags flags_;
+  Handle<Map> known_initial_map_;
 };
 
 
@@ -5132,7 +5099,6 @@ inline bool ReceiverObjectNeedsWriteBarrier(HValue* object,
     return false;
   }
   if (object != new_space_dominator) return true;
-  if (object->IsAllocateObject()) return false;
   if (object->IsAllocate()) {
     return !HAllocate::cast(object)->GuaranteedInNewSpace();
   }