Re-ship harmony spread calls and spread arrays

The issue with spread arrays which caused us to turn it off was fixed in
https://chromium.googlesource.com/v8/v8/+/24e98281

BUG=v8:3018
LOG=y

Review URL: https://codereview.chromium.org/1239873002

Cr-Commit-Position: refs/heads/master@{#29713}

src/flag-definitions.h

@@ -200,17 +200,17 @@ DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
   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_concat_spreadable, "harmony isConcatSpreadable")    \
-  V(harmony_rest_parameters, "harmony rest parameters")         \
-  V(harmony_spreadcalls, "harmony spread-calls")                \
-  V(harmony_spread_arrays, "harmony spread in array literals")
+#define HARMONY_STAGED(V)                                    \
+  V(harmony_tostring, "harmony toString")                    \
+  V(harmony_concat_spreadable, "harmony isConcatSpreadable") \
+  V(harmony_rest_parameters, "harmony rest parameters")
 
 // Features that are shipping (turned on by default, but internal flag remains).
 #define HARMONY_SHIPPING(V)                                             \
   V(harmony_arrow_functions, "harmony arrow functions")                 \
   V(harmony_computed_property_names, "harmony computed property names") \
+  V(harmony_spreadcalls, "harmony spread-calls")                        \
+  V(harmony_spread_arrays, "harmony spread in array literals")          \
   V(harmony_unicode, "harmony unicode escapes")                         \
   V(harmony_object, "harmony Object methods")