[regexp] Stage the dotall flag

src/flag-definitions.h

Index: src/flag-definitions.h
diff --git a/src/flag-definitions.h b/src/flag-definitions.h
index aa11e528ea6ab238fd5c7c98ac9518aab86ab9f5..89b2c624a51d575f513ef3b51f1475b5fd87f103 100644
--- a/src/flag-definitions.h
+++ b/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_dotall, "harmony regexp dotall flag")                \
   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")                 \
@@ -209,6 +208,7 @@ DEFINE_IMPLICATION(es_staging, harmony)
 // Features that are complete (but still behind --harmony/es-staging flag).
 #define HARMONY_STAGED(V)                                                \
   V(harmony_function_tostring, "harmony Function.prototype.toString")    \
+  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_restrictive_generators,                                      \