[handles] Use v8_flags for accessing flag values

Avoid the deprecated FLAG_* syntax, access flag values via the
{v8_flags} struct instead.

R=dinfuehr@chromium.org

Bug: v8:12887
Change-Id: Icc9e1d2db58999b676477924284f78043cf5533c
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3899124Reviewed-by: Dominik Inführ <dinfuehr@chromium.org>
Commit-Queue: Clemens Backes <clemensb@chromium.org>
Cr-Commit-Position: refs/heads/main@{#83263}

src/handles/global-handles.cc

@@ -817,7 +817,7 @@ Handle<Object> GlobalHandles::CopyGlobal(Address* location) {
   GlobalHandles* global_handles =
       Node::FromLocation(location)->global_handles();
 #ifdef VERIFY_HEAP
-  if (i::FLAG_verify_heap) {
+  if (v8_flags.verify_heap) {
     Object(*location).ObjectVerify(global_handles->isolate());
   }
 #endif  // VERIFY_HEAP
@@ -847,7 +847,7 @@ void GlobalHandles::CopyTracedReference(const Address* const* from,
   TracedNode::Verify(from);
   TracedNode::Verify(to);
 #ifdef VERIFY_HEAP
-  if (i::FLAG_verify_heap) {
+  if (v8_flags.verify_heap) {
     Object(**to).ObjectVerify(global_handles->isolate());
   }
 #endif  // VERIFY_HEAP
@@ -1022,7 +1022,7 @@ void GlobalHandles::IterateWeakRootsForPhantomHandles(
 
 void GlobalHandles::ComputeWeaknessForYoungObjects(
     WeakSlotCallback is_unmodified) {
-  if (!FLAG_reclaim_unmodified_wrappers) return;
+  if (!v8_flags.reclaim_unmodified_wrappers) return;
 
   // Treat all objects as roots during incremental marking to avoid corrupting
   // marking worklists.
@@ -1068,7 +1068,7 @@ void GlobalHandles::ProcessWeakYoungObjects(
     }
   }
 
-  if (!FLAG_reclaim_unmodified_wrappers) return;
+  if (!v8_flags.reclaim_unmodified_wrappers) return;
 
   auto* const handler = isolate()->heap()->GetEmbedderRootsHandler();
   for (TracedNode* node : traced_young_nodes_) {
@@ -1220,7 +1220,7 @@ void GlobalHandles::PostGarbageCollectionProcessing(
   DCHECK_EQ(Heap::NOT_IN_GC, isolate_->heap()->gc_state());
 
   const bool synchronous_second_pass =
-      FLAG_optimize_for_size || FLAG_predictable ||
+      v8_flags.optimize_for_size || v8_flags.predictable ||
       isolate_->heap()->IsTearingDown() ||
       (gc_callback_flags &
        (kGCCallbackFlagForced | kGCCallbackFlagCollectAllAvailableGarbage |

src/handles/handles-inl.h

@@ -115,7 +115,7 @@ HandleScope& HandleScope::operator=(HandleScope&& other) V8_NOEXCEPT {
 void HandleScope::CloseScope(Isolate* isolate, Address* prev_next,
                              Address* prev_limit) {
 #ifdef DEBUG
-  int before = FLAG_check_handle_count ? NumberOfHandles(isolate) : 0;
+  int before = v8_flags.check_handle_count ? NumberOfHandles(isolate) : 0;
 #endif
   DCHECK_NOT_NULL(isolate);
   HandleScopeData* current = isolate->handle_scope_data();
@@ -136,7 +136,7 @@ void HandleScope::CloseScope(Isolate* isolate, Address* prev_next,
       static_cast<size_t>(reinterpret_cast<Address>(limit) -
                           reinterpret_cast<Address>(current->next)));
 #ifdef DEBUG
-  int after = FLAG_check_handle_count ? NumberOfHandles(isolate) : 0;
+  int after = v8_flags.check_handle_count ? NumberOfHandles(isolate) : 0;
   DCHECK_LT(after - before, kCheckHandleThreshold);
   DCHECK_LT(before, kCheckHandleThreshold);
 #endif