[async-functions] support await expressions in finally statements

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 1331 matching lines @@
 }
 
 Scope* Scope::GetOuterScopeWithContext() {
   Scope* scope = outer_scope_;
   while (scope && !scope->NeedsContext()) {
     scope = scope->outer_scope();
   }
   return scope;
 }
 
+bool Scope::HasLazilyParsedInnerFunctionScope() const {
+  for (Scope* scope = inner_scope_; scope; scope = scope->sibling_) {
+    if (scope->is_function_scope()) {
+      if (static_cast<DeclarationScope*>(scope)->was_lazily_parsed()) {
+        return true;
+      }
+    }
+    if (scope->HasLazilyParsedInnerFunctionScope()) return true;
+  }
+  return false;
+}
+
 Handle<StringSet> DeclarationScope::CollectNonLocals(
     ParseInfo* info, Handle<StringSet> non_locals) {
   VariableProxy* free_variables = FetchFreeVariables(this, info);
   for (VariableProxy* proxy = free_variables; proxy != nullptr;
        proxy = proxy->next_unresolved()) {
     non_locals = StringSet::Add(non_locals, proxy->name());
   }
   return non_locals;
 }
 
@@ skipping 845 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