ARM: Implement runtime function for array literal transitions.

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 14a04dc5dddb1180d7e99306eb9ed32455d6756d..1aa7dc59c2e66689142810bbb842b6a6f0c50c32 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -167,6 +167,8 @@ static const int kElementsKindCount =
 
 void PrintElementsKind(FILE* out, ElementsKind kind);
 
+inline bool IsMoreGeneralElementsKindTransition(ElementsKind from_kind,
+                                                ElementsKind to_kind);
 
 // Setter that skips the write barrier if mode is SKIP_WRITE_BARRIER.
 enum WriteBarrierMode { SKIP_WRITE_BARRIER, UPDATE_WRITE_BARRIER };