Don't wrap roots in Handle just to dereference immediately.

src/runtime/runtime-debug.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/runtime/runtime-utils.h"
 
 #include "src/arguments.h"
 #include "src/debug/debug-evaluate.h"
 #include "src/debug/debug-frames.h"
 #include "src/debug/debug-scopes.h"
@@ skipping 930 matching lines @@
   }
 
   return Smi::FromInt(n);
 }
 
 RUNTIME_FUNCTION(Runtime_GetGeneratorScopeDetails) {
   HandleScope scope(isolate);
   DCHECK(args.length() == 2);
 
   if (!args[0]->IsJSGeneratorObject()) {
-    return *isolate->factory()->undefined_value();
+    return isolate->heap()->undefined_value();
   }
 
   // Check arguments.
   CONVERT_ARG_HANDLE_CHECKED(JSGeneratorObject, gen, 0);
   CONVERT_NUMBER_CHECKED(int, index, Int32, args[1]);
 
   // Find the requested scope.
   int n = 0;
   ScopeIterator it(isolate, gen);
   for (; !it.Done() && n < index; it.Next()) {
@@ skipping 912 matching lines @@
   Handle<Script> script = Handle<Script>(Script::cast(script_val->value()));
 
   Handle<wasm::WasmDebugInfo> debug_info =
       wasm::GetDebugInfo(handle(script->wasm_instance(), isolate));
   return *wasm::WasmDebugInfo::DisassembleFunction(
       debug_info, script->wasm_function_index());
 }
 
 }  // namespace internal
 }  // namespace v8