[async-iteration] add support for for-await-of loops in Async Functions

src/interpreter/constant-array-builder.cc

 // Copyright 2015 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/interpreter/constant-array-builder.h"
 
 #include <functional>
 #include <set>
 
 #include "src/ast/ast-value-factory.h"
@@ skipping 301 matching lines @@
       return handle_;
     case Tag::kSmi:
       return handle(smi_, isolate);
     case Tag::kRawString:
       return raw_string_->string();
     case Tag::kHeapNumber:
       DCHECK(heap_number_->IsHeapNumber());
       return heap_number_->value();
     case Tag::kScope:
       return scope_->scope_info();
-    case Tag::kIteratorSymbol:
-      return isolate->factory()->iterator_symbol();
-    case Tag::kHomeObjectSymbol:
-      return isolate->factory()->home_object_symbol();
-    case Tag::kEmptyFixedArray:
-      return isolate->factory()->empty_fixed_array();
+#define ENTRY_LOOKUP(Name, name) \
+  case Tag::k##Name:             \
+    return isolate->factory()->name();
+      SINGLETON_CONSTANT_ENTRY_TYPES(ENTRY_LOOKUP);
+#undef ENTRY_LOOKUP

[caitp, 2017/02/10 19:38:41]

+leszeks@chromium.org  << does this seem like a reasonable way to do this? It
might be nicer than making changes to this file every time a new per-isolate
constant is needed, though I don't expect that to happen often.

   }
   UNREACHABLE();
   return Handle<Object>::null();
 }
 
 }  // namespace interpreter
 }  // namespace internal
 }  // namespace v8