Stage --harmony-array-includes

BUG=v8:3575
R=adamk@chromium.org, rossberg@chromium.org
LOG=Y
CQ_INCLUDE_TRYBOTS=tryserver.chromium.linux:linux_chromium_rel_ng;tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1283963002

Cr-Commit-Position: refs/heads/master@{#30121}

src/flag-definitions.h

@@ -187,7 +187,6 @@ DEFINE_BOOL(legacy_const, true, "legacy semantics for const in sloppy mode")
 // Features that are still work in progress (behind individual flags).
 #define HARMONY_INPROGRESS(V)                                   \
   V(harmony_modules, "harmony modules")                         \
-  V(harmony_array_includes, "harmony Array.prototype.includes") \
   V(harmony_regexps, "harmony regular expression extensions")   \
   V(harmony_proxies, "harmony proxies")                         \
   V(harmony_sloppy, "harmony features in sloppy mode")          \
@@ -200,18 +199,19 @@ 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") \
+#define HARMONY_STAGED(V)                                       \
+  V(harmony_array_includes, "harmony Array.prototype.includes") \
+  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_new_target, "harmony new.target")                           \
-  V(harmony_object_observe, "harmony Object.observe")                   \
-  V(harmony_spreadcalls, "harmony spread-calls")                        \
-  V(harmony_spread_arrays, "harmony spread in array literals")          \
+#define HARMONY_SHIPPING(V)                                    \
+  V(harmony_arrow_functions, "harmony arrow functions")        \
+  V(harmony_new_target, "harmony new.target")                  \
+  V(harmony_object_observe, "harmony Object.observe")          \
+  V(harmony_spreadcalls, "harmony spread-calls")               \
+  V(harmony_spread_arrays, "harmony spread in array literals") \
   V(harmony_object, "harmony Object methods")
 
 // Once a shipping feature has proved stable in the wild, it will be dropped