[es6] Stage --harmony-completion.

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index 9f350a150fcd575cb5da944282d9a22a537b3652..e7261be8751db4f2c6b813de7ec765044b877fb2 100644
--- a/src/flag-definitions.h
+++ b/src/flag-definitions.h
@@ -198,15 +198,15 @@ DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
   V(harmony_destructuring, "harmony destructuring")                   \
   V(harmony_default_parameters, "harmony default parameters")         \
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")           \
-  V(harmony_simd, "harmony simd")                                     \
-  V(harmony_completion, "harmony completion value semantics")
+  V(harmony_simd, "harmony simd")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                              \
   V(harmony_tostring, "harmony toString")              \
   V(harmony_sloppy, "harmony features in sloppy mode") \
   V(harmony_sloppy_let, "harmony let in sloppy mode")  \
-  V(harmony_sloppy_function, "harmony sloppy function block scoping")
+  V(harmony_sloppy_function, "harmony sloppy function block scoping") \
+  V(harmony_completion, "harmony completion value semantics")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                     \