Remove --always-use-string-forwarding-table from --future

Bug: chromium:1336516
Change-Id: I28a2b9d72e00a17792f80cf2a65312eeb47f165a
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3707290
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Auto-Submit: Patrick Thier <pthier@chromium.org>
Cr-Commit-Position: refs/heads/main@{#81223}

src/flags/flag-definitions.h

@@ -747,10 +747,6 @@ DEFINE_BOOL(
 // (enabled by --shared-string-table) are not supported using a single shared
 // forwarding table.
 DEFINE_NEG_IMPLICATION(shared_string_table, always_use_string_forwarding_table)
-// TOOD(pthier): The code behind this flag is not going to ship.
-// We enable it behind --future to get performance numbers and coverage from
-// bots.
-DEFINE_WEAK_IMPLICATION(future, always_use_string_forwarding_table)
 
 DEFINE_BOOL(write_code_using_rwx, true,
             "flip permissions to rwx to write page instead of rw")