Reland of Ship async functions (patchset #1 id:1 of https://codereview.chromium.org/2364963003/ )

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 975a607ba902cbf3e719909f40e27360810b9bd8..d56cb3b2b8f121c0b8dc839a9af0a8c1fb6d4a36 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -213,7 +213,6 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
 #define HARMONY_STAGED_BASE(V)                                               \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")                  \
   V(harmony_tailcalls, "harmony tail calls")                                 \
-  V(harmony_async_await, "harmony async-await")                              \
   V(harmony_string_padding, "harmony String-padding methods")
 
 #ifdef V8_I18N_SUPPORT
@@ -227,6 +226,7 @@ DEFINE_IMPLICATION(es_staging, move_object_start)
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                                  \
+  V(harmony_async_await, "harmony async-await")                              \
   V(harmony_restrictive_declarations,                                        \
     "harmony limitations on sloppy mode function declarations")              \
   V(harmony_object_values_entries, "harmony Object.values / Object.entries") \