[async-iteration] expose Symbol.asyncIterator behind flag --harmony-async-iteration

src/flag-definitions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines all of the flags.  It is separated into different section,
 // for Debug, Release, Logging and Profiling, etc.  To add a new flag, find the
 // correct section, and use one of the DEFINE_ macros, without a trailing ';'.
 //
 // This include does not have a guard, because it is a template-style include,
 // which can be included multiple times in different modes.  It expects to have
@@ skipping 175 matching lines @@
 DEFINE_BOOL(harmony, false, "enable all completed harmony features")
 DEFINE_BOOL(harmony_shipping, true, "enable all shipped harmony features")
 DEFINE_IMPLICATION(es_staging, harmony)
 
 
 // Activate on ClusterFuzz.
 DEFINE_IMPLICATION(es_staging, harmony_regexp_lookbehind)
 DEFINE_IMPLICATION(es_staging, move_object_start)
 
 // Features that are still work in progress (behind individual flags).
-#define HARMONY_INPROGRESS(V)                                           \
-  V(harmony_array_prototype_values, "harmony Array.prototype.values")   \
-  V(harmony_function_sent, "harmony function.sent")                     \
-  V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")             \
-  V(harmony_simd, "harmony simd")                                       \
-  V(harmony_do_expressions, "harmony do-expressions")                   \
-  V(harmony_regexp_named_captures, "harmony regexp named captures")     \
-  V(harmony_regexp_property, "harmony unicode regexp property classes") \
-  V(harmony_class_fields, "harmony public fields in class literals")    \
-  V(harmony_object_rest_spread, "harmony object rest spread properties")
+#define HARMONY_INPROGRESS(V)                                            \
+  V(harmony_array_prototype_values, "harmony Array.prototype.values")    \
+  V(harmony_function_sent, "harmony function.sent")                      \
+  V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")              \
+  V(harmony_simd, "harmony simd")                                        \
+  V(harmony_do_expressions, "harmony do-expressions")                    \
+  V(harmony_regexp_named_captures, "harmony regexp named captures")      \
+  V(harmony_regexp_property, "harmony unicode regexp property classes")  \
+  V(harmony_class_fields, "harmony public fields in class literals")     \
+  V(harmony_object_rest_spread, "harmony object rest spread properties") \
+  V(harmony_async_iteration, "harmony async iteration")
 
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                   \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind") \
   V(harmony_restrictive_generators,                         \
     "harmony restrictions on generator declarations")       \
   V(harmony_tailcalls, "harmony tail calls")                \
   V(harmony_trailing_commas,                                \
     "harmony trailing commas in function parameter lists")
 
@@ skipping 1068 matching lines @@
 #undef DEFINE_ALIAS_FLOAT
 #undef DEFINE_ALIAS_ARGS
 
 #undef FLAG_MODE_DECLARE
 #undef FLAG_MODE_DEFINE
 #undef FLAG_MODE_DEFINE_DEFAULTS
 #undef FLAG_MODE_META
 #undef FLAG_MODE_DEFINE_IMPLICATIONS
 
 #undef COMMA