Disable --turbo-direct-heap-access by default

Bug: v8:10917, v8:7790
No-Try: true
Change-Id: I11dfd404e619dd547923421ff7aef3428c746243
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2410190
Auto-Submit: Georg Neis <neis@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#69903}

src/flags/flag-definitions.h

@@ -538,7 +538,7 @@ 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_BOOL(turbo_direct_heap_access, true,
+DEFINE_BOOL(turbo_direct_heap_access, false,
             "access kNeverSerialized objects directly from the heap")
 DEFINE_IMPLICATION(concurrent_inlining, turbo_direct_heap_access)
 DEFINE_IMPLICATION(turbo_direct_heap_access, local_heaps)