Turn on harmony_collections for es_staging

BUG=v8:1622
LOG=Y
R=arv@chromium.org, rossberg@chromium.org

Review URL: https://codereview.chromium.org/313153002

git-svn-id: https://v8.googlecode.com/svn/branches/bleeding_edge@21703 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/flag-definitions.h

@@ -183,6 +183,7 @@ DEFINE_implication(harmony_collections, harmony_symbols)
 DEFINE_implication(harmony, es_staging)
 DEFINE_implication(es_staging, harmony_maths)
 DEFINE_implication(es_staging, harmony_symbols)
+DEFINE_implication(es_staging, harmony_collections)
 
 // Flags for experimental implementation features.
 DEFINE_bool(packed_arrays, true, "optimizes arrays that have no holes")