[async-await] (simpler) fix for Return in try/finally in async functions

src/ast/ast-numbering.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/ast-numbering.h"
 
 #include "src/ast/ast.h"
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
 #include "src/objects-inl.h"
@@ skipping 216 matching lines @@
 
 void AstNumberingVisitor::VisitExpressionStatement(ExpressionStatement* node) {
   IncrementNodeCount();
   Visit(node->expression());
 }
 
 
 void AstNumberingVisitor::VisitReturnStatement(ReturnStatement* node) {
   IncrementNodeCount();
   Visit(node->expression());
+
+  DCHECK(!node->is_async_return() ||
+         properties_.flags() & AstProperties::kMustUseIgnitionTurbo);
 }
 
 
 void AstNumberingVisitor::VisitYield(Yield* node) {
   node->set_yield_id(yield_count_);
   yield_count_++;
   IncrementNodeCount();
   node->set_base_id(ReserveIdRange(Yield::num_ids()));
   Visit(node->generator_object());
   Visit(node->expression());
@@ skipping 465 matching lines @@
     Compiler::EagerInnerFunctionLiterals* eager_literals) {
   DisallowHeapAllocation no_allocation;
   DisallowHandleAllocation no_handles;
   DisallowHandleDereference no_deref;
 
   AstNumberingVisitor visitor(stack_limit, zone, eager_literals);
   return visitor.Renumber(function);
 }
 }  // namespace internal
 }  // namespace v8