[inspector] fixed crash on attempt to access empty scope_info on break

src/ast/scopes.cc

 // Copyright 2012 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/ast/scopes.h"
 
 #include <set>
 
 #include "src/accessors.h"
 #include "src/ast/ast.h"
@@ skipping 2242 matching lines @@
   }
 }
 
 void Scope::AllocateDebuggerScopeInfos(Isolate* isolate,
                                        MaybeHandle<ScopeInfo> outer_scope) {
   if (scope_info_.is_null()) {
     scope_info_ = ScopeInfo::Create(isolate, zone(), this, outer_scope);
   }
   MaybeHandle<ScopeInfo> outer = NeedsContext() ? scope_info_ : outer_scope;
   for (Scope* scope = inner_scope_; scope != nullptr; scope = scope->sibling_) {
-    if (scope->is_function_scope()) continue;
-    scope->AllocateDebuggerScopeInfos(isolate, outer);
+    if (!scope->is_function_scope() ||
+        scope->AsDeclarationScope()->is_arrow_scope()) {
+      scope->AllocateDebuggerScopeInfos(isolate, outer);
+    }
   }
 }
 
 void Scope::CollectVariableData(PreParsedScopeData* data) {
   PreParsedScopeData::ScopeScope scope_scope(data, scope_type(),
                                              start_position(), end_position());
   for (Variable* local : locals_) {
     scope_scope.MaybeAddVariable(local);
   }
   for (Scope* inner = inner_scope_; inner != nullptr; inner = inner->sibling_) {
@@ skipping 14 matching lines @@
   Variable* function =
       is_function_scope() ? AsDeclarationScope()->function_var() : nullptr;
   bool is_function_var_in_context =
       function != nullptr && function->IsContextSlot();
   return num_heap_slots() - Context::MIN_CONTEXT_SLOTS -
          (is_function_var_in_context ? 1 : 0);
 }
 
 }  // namespace internal
 }  // namespace v8