[regexp] Add experimental regexp engine flags

R=jgruber@chromium.org

Bug: v8:10765
Change-Id: Iae389bd129784c08287dec7c4cb8ebeaa6a6120c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2336794
Commit-Queue: Jakob Gruber <jgruber@chromium.org>
Reviewed-by: Jakob Gruber <jgruber@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69237}

AUTHORS

@@ -94,6 +94,7 @@ Filipe David Manana <fdmanana@gmail.com>
 Franziska Hinkelmann <franziska.hinkelmann@gmail.com>
 Geoffrey Garside <ggarside@gmail.com>
 Gergely Nagy <ngg@ngg.hu>
+Gilang Mentari Hamidy <gilang@hamidy.net>
 Gus Caplan <me@gus.host>
 Gwang Yoon Hwang <ryumiel@company100.net>
 Hannu Trey <hannu.trey@gmail.com>
@@ -133,6 +134,7 @@ Luke Zarko <lukezarko@gmail.com>
 Maciej Małecki <me@mmalecki.com>
 Marcin Cieślak <saper@marcincieslak.com>
 Marcin Wiącek <marcin@mwiacek.com>
+Martin Bidlingmaier <martin.bidlingmaier@gmail.com>
 Mateusz Czeladka <mateusz.szczap@gmail.com>
 Matheus Marchini <mat@mmarchini.me>
 Matheus Marchini <mmarchini@netflix.com>
@@ -207,14 +209,13 @@ Wenlu Wang <kingwenlu@gmail.com>
 Wiktor Garbacz <wiktor.garbacz@gmail.com>
 Wouter Vermeiren <wouter.vermeiren@essensium.com>
 Xiaoyin Liu <xiaoyin.l@outlook.com>
+Yanbo Li <lybvinci@gmail.com>
 Yannic Bonenberger <contact@yannic-bonenberger.com>
 Yong Wang <ccyongwang@tencent.com>
 Youfeng Hao <ajihyf@gmail.com>
 Yu Yin <xwafish@gmail.com>
 Zac Hansen <xaxxon@gmail.com>
+Zeynep Cankara <zeynepcankara402@gmail.com>
 Zhao Jiazhong <kyslie3100@gmail.com>
 Zhongping Wang <kewpie.w.zp@gmail.com>
 柳荣一 <admin@web-tinker.com>
-Yanbo Li <lybvinci@gmail.com>
-Gilang Mentari Hamidy <gilang@hamidy.net>
-Zeynep Cankara <zeynepcankara402@gmail.com>

src/flags/flag-definitions.h

@@ -1424,6 +1424,11 @@ DEFINE_BOOL(trace_regexp_assembler, false,
 DEFINE_BOOL(trace_regexp_parser, false, "trace regexp parsing")
 DEFINE_BOOL(trace_regexp_tier_up, false, "trace regexp tiering up execution")
 
+DEFINE_BOOL(enable_experimental_regexp_engine, false,
+            "enable experimental linear time regexp engine")
+DEFINE_BOOL(trace_experimental_regexp_engine, false,
+            "trace execution of experimental regexp engine")
+
 // Testing flags test/cctest/test-{flags,api,serialization}.cc
 DEFINE_BOOL(testing_bool_flag, true, "testing_bool_flag")
 DEFINE_MAYBE_BOOL(testing_maybe_bool_flag, "testing_maybe_bool_flag")