[osr] Move --concurrent-osr to --future

Bug: v8:12161
Change-Id: Idb393836d787f348462c263c7f61e1a8b02b6729
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3582390
Auto-Submit: Jakob Linke <jgruber@chromium.org>
Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/main@{#79983}

src/flags/flag-definitions.h

@@ -880,7 +880,8 @@ DEFINE_BOOL(trace_turbo_inlining, false, "trace TurboFan inlining")
 DEFINE_BOOL(turbo_inline_array_builtins, true,
             "inline array builtins in TurboFan code")
 DEFINE_BOOL(use_osr, true, "use on-stack replacement")
-DEFINE_BOOL(concurrent_osr, true, "enable concurrent OSR")
+DEFINE_BOOL(concurrent_osr, false, "enable concurrent OSR")
+DEFINE_WEAK_IMPLICATION(future, concurrent_osr)
 DEFINE_BOOL(trace_osr, false, "trace on-stack replacement")
 DEFINE_BOOL(analyze_environment_liveness, true,
             "analyze liveness of environment slots and zap dead values")