Revert "Temporarily remove --concurrent-inlining from --future"

This reverts commit 060b9ec4, as the
issue has been resolved.

Bug: v8:7790
Change-Id: Id8a56ad50a508eacd191f2777cc5afc0b838364f
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1700078
Commit-Queue: Georg Neis <neis@chromium.org>
Commit-Queue: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Michael Stanton <mvstanton@chromium.org>
Reviewed-by: Maya Lekova <mslekova@chromium.org>
Auto-Submit: Georg Neis <neis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#62713}

src/flags/flag-definitions.h

@@ -451,6 +451,7 @@ DEFINE_BOOL(block_concurrent_recompilation, false,
             "block queued jobs until released")
 DEFINE_BOOL(concurrent_inlining, false,
             "run optimizing compiler's inlining phase on a separate thread")
+DEFINE_IMPLICATION(future, concurrent_inlining)
 DEFINE_BOOL(trace_heap_broker_verbose, false,
             "trace the heap broker verbosely (all reports)")
 DEFINE_BOOL(trace_heap_broker, false,