Hydrogen stubs for array constructors

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 8010b94fe7d3fdf6ed172e02b9d88737fe171101..0eb49e854ee3bd25c6318242be7fa6ba30bdad5f 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -1721,6 +1721,8 @@ class JSObject: public JSReceiver {
   bool HasDictionaryArgumentsElements();
   inline SeededNumberDictionary* element_dictionary();  // Gets slow elements.
 
+  inline bool ShouldTrackAllocationInfo();
+
   inline void set_map_and_elements(
       Map* map,
       FixedArrayBase* value,
@@ -7245,9 +7247,9 @@ class AllocationSiteInfo: public Struct {
 
   // Returns NULL if no AllocationSiteInfo is available for object.
   static AllocationSiteInfo* FindForJSObject(JSObject* object);
-
-  static AllocationSiteMode GetMode(ElementsKind boilerplate_elements_kind);
-  static AllocationSiteMode GetMode(ElementsKind from, ElementsKind to);
+  static inline AllocationSiteMode GetMode(
+      ElementsKind boilerplate_elements_kind);
+  static inline AllocationSiteMode GetMode(ElementsKind from, ElementsKind to);
 
   static const int kPayloadOffset = HeapObject::kHeaderSize;
   static const int kSize = kPayloadOffset + kPointerSize;
@@ -8699,6 +8701,10 @@ class JSArray: public JSObject {
 };
 
 
+MUST_USE_RESULT MaybeObject* CacheInitialJSArrayMaps(
+    Context* native_context, Map* initial_map);
+
+
 // JSRegExpResult is just a JSArray with a specific initial map.
 // This initial map adds in-object properties for "index" and "input"
 // properties, as assigned by RegExp.prototype.exec, which allows