Add new Harmony methods to Array.prototype object.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 5fc5d880b3e236e559451fa1939cd66f289255a7..bac9c468bcc1eae8f0d99d27c400f002af88b07a 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -174,6 +174,7 @@ DEFINE_bool(harmony_iteration, false, "enable harmony iteration (for-of)")
 DEFINE_bool(harmony_numeric_literals, false,
             "enable harmony numeric literals (0o77, 0b11)")
 DEFINE_bool(harmony_strings, false, "enable harmony string")
+DEFINE_bool(harmony_arrays, false, "enable harmony arrays")
 DEFINE_bool(harmony, false, "enable all harmony features (except typeof)")
 DEFINE_implication(harmony, harmony_scoping)
 DEFINE_implication(harmony, harmony_modules)
@@ -185,6 +186,7 @@ DEFINE_implication(harmony, harmony_generators)
 DEFINE_implication(harmony, harmony_iteration)
 DEFINE_implication(harmony, harmony_numeric_literals)
 DEFINE_implication(harmony, harmony_strings)
+DEFINE_implication(harmony, harmony_arrays)
 DEFINE_implication(harmony_modules, harmony_scoping)
 DEFINE_implication(harmony_observation, harmony_collections)
 // TODO[dslomov] add harmony => harmony_typed_arrays