deps: backport b107214 from upstream V8

Original commit message:

    [code-serializer] Handlify in CodeSerializer::Deserialize

    This section potentially contains allocations and thus gc, all object
    references should be handlified.

    Bug: v8:9333
    Change-Id: I5814e66e8b9b75a8bd952afecae7a3a27b42a642
    Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/1647695
    Auto-Submit: Jakob Gruber <jgruber@chromium.org>
    Commit-Queue: Simon Zünd <szuend@chromium.org>
    Reviewed-by: Simon Zünd <szuend@chromium.org>
    Cr-Commit-Position: refs/heads/master@{#62012}

(This required resolution of a few merge conflicts, so it’s essentially
a manual backport.)

Refs: v8/v8@b107214
Refs: #28847

PR-URL: #28850
Reviewed-By: Rich Trott <rtrott@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>
Reviewed-By: Jan Krems <jan.krems@gmail.com>

Author: addaleax

deps/v8/src/snapshot/code-serializer.cc

@@ -303,7 +303,7 @@ MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
     PrintF("[Deserializing from %d bytes took %0.3f ms]\n", length, ms);
   }
 
-  bool log_code_creation =
+  const bool log_code_creation =
       isolate->logger()->is_listening_to_code_events() ||
       isolate->is_profiling() ||
       isolate->code_event_dispatcher()->IsListeningToCodeEvents();
@@ -315,27 +315,28 @@ MaybeHandle<SharedFunctionInfo> CodeSerializer::Deserialize(
 #endif  // V8_TARGET_ARCH_ARM
 
   if (log_code_creation || FLAG_log_function_events) {
-    String name = ReadOnlyRoots(isolate).empty_string();
-    Script script = Script::cast(result->script());
-    Handle<Script> script_handle(script, isolate);
-    if (script->name()->IsString()) name = String::cast(script->name());
+    Handle<Script> script(Script::cast(result->script()), isolate);
+    Handle<String> name(script->name().IsString()
+                            ? String::cast(script->name())
+                            : ReadOnlyRoots(isolate).empty_string(),
+                        isolate);
     if (FLAG_log_function_events) {
       LOG(isolate,
           FunctionEvent("deserialize", script->id(),
                         timer.Elapsed().InMillisecondsF(),
-                        result->StartPosition(), result->EndPosition(), name));
+                        result->StartPosition(), result->EndPosition(), *name));
     }
     if (log_code_creation) {
-      Script::InitLineEnds(Handle<Script>(script, isolate));
+      Script::InitLineEnds(script);
       DisallowHeapAllocation no_gc;
-      SharedFunctionInfo::ScriptIterator iter(isolate, script);
+      SharedFunctionInfo::ScriptIterator iter(isolate, *script);
       for (i::SharedFunctionInfo info = iter.Next(); !info.is_null();
            info = iter.Next()) {
         if (info->is_compiled()) {
           int line_num = script->GetLineNumber(info->StartPosition()) + 1;
           int column_num = script->GetColumnNumber(info->StartPosition()) + 1;
           PROFILE(isolate, CodeCreateEvent(CodeEventListener::SCRIPT_TAG,
-                                           info->abstract_code(), info, name,
+                                           info->abstract_code(), info, *name,
                                            line_num, column_num));
         }
       }