[regexp] stage --harmony-regexp-property

R=adamk@chromium.org
BUG=v8:4743

Review-Url: https://codereview.chromium.org/2801263002
Cr-Commit-Position: refs/heads/master@{#44493}

src/flag-definitions.h

@@ -199,7 +199,6 @@ DEFINE_IMPLICATION(es_staging, harmony)
   V(harmony_tailcalls, "harmony tail calls")                            \
   V(harmony_sharedarraybuffer, "harmony sharedarraybuffer")             \
   V(harmony_do_expressions, "harmony do-expressions")                   \
-  V(harmony_regexp_property, "harmony unicode regexp property classes") \
   V(harmony_class_fields, "harmony public fields in class literals")    \
   V(harmony_async_iteration, "harmony async iteration")                 \
   V(harmony_dynamic_import, "harmony dynamic import")                   \
@@ -211,6 +210,7 @@ DEFINE_IMPLICATION(es_staging, harmony)
   V(harmony_regexp_dotall, "harmony regexp dotall flag")                 \
   V(harmony_regexp_lookbehind, "harmony regexp lookbehind")              \
   V(harmony_regexp_named_captures, "harmony regexp named captures")      \
+  V(harmony_regexp_property, "harmony unicode regexp property classes")  \
   V(harmony_restrictive_generators,                                      \
     "harmony restrictions on generator declarations")                    \
   V(harmony_object_rest_spread, "harmony object rest spread properties") \