Update ObjectToString to Harmony-draft algorithm

src/heap/heap.h

Index: src/heap/heap.h
diff --git a/src/heap/heap.h b/src/heap/heap.h
index e844b3ad807636f4aa6babea62c179e8bdbadecd..695ad8ae9e2bf482304dafae9c0cdc39b0edc80a 100644
--- a/src/heap/heap.h
+++ b/src/heap/heap.h
@@ -325,7 +325,10 @@ namespace internal {
   V(next_string, "next")                                   \
   V(byte_length_string, "byteLength")                      \
   V(byte_offset_string, "byteOffset")                      \
-  V(minus_zero_string, "-0")
+  V(minus_zero_string, "-0")                               \
+  V(Array_string, "Array")                                 \
+  V(Error_string, "Error")                                 \
+  V(RegExp_string, "RegExp")
 
 #define PRIVATE_SYMBOL_LIST(V)      \
   V(frozen_symbol)                  \