WIP [esnext] implement async iteration proposal

src/compiler/types.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 <iomanip>
 
 #include "src/compiler/types.h"
 
 #include "src/handles-inl.h"
 #include "src/objects-inl.h"
@@ skipping 198 matching lines @@
       }
       if (map->is_callable()) {
         return kOtherCallable;
       }
       return kOtherObject;
     case JS_VALUE_TYPE:
     case JS_MESSAGE_OBJECT_TYPE:
     case JS_DATE_TYPE:
     case JS_CONTEXT_EXTENSION_OBJECT_TYPE:
     case JS_GENERATOR_OBJECT_TYPE:
+    case JS_ASYNC_GENERATOR_OBJECT_TYPE:
+    case JS_ASYNC_FROM_SYNC_ITERATOR_TYPE:
     case JS_MODULE_NAMESPACE_TYPE:
     case JS_ARRAY_BUFFER_TYPE:
     case JS_ARRAY_TYPE:
     case JS_REGEXP_TYPE:  // TODO(rossberg): there should be a RegExp type.
     case JS_TYPED_ARRAY_TYPE:
     case JS_DATA_VIEW_TYPE:
     case JS_SET_TYPE:
     case JS_MAP_TYPE:
     case JS_SET_ITERATOR_TYPE:
     case JS_MAP_ITERATOR_TYPE:
@@ skipping 84 matching lines @@
     case ACCESS_CHECK_INFO_TYPE:
     case INTERCEPTOR_INFO_TYPE:
     case CALL_HANDLER_INFO_TYPE:
     case OBJECT_TEMPLATE_INFO_TYPE:
     case ALLOCATION_MEMENTO_TYPE:
     case TYPE_FEEDBACK_INFO_TYPE:
     case ALIASED_ARGUMENTS_ENTRY_TYPE:
     case BOX_TYPE:
     case PROMISE_RESOLVE_THENABLE_JOB_INFO_TYPE:
     case PROMISE_REACTION_JOB_INFO_TYPE:
+    case ASYNC_GENERATOR_REQUEST_TYPE:
     case DEBUG_INFO_TYPE:
     case BREAK_POINT_INFO_TYPE:
     case CELL_TYPE:
     case WEAK_CELL_TYPE:
     case PROTOTYPE_INFO_TYPE:
     case TUPLE2_TYPE:
     case TUPLE3_TYPE:
     case CONTEXT_EXTENSION_TYPE:
     case CONSTANT_ELEMENTS_PAIR_TYPE:
       UNREACHABLE();
@@ skipping 731 matching lines @@
   return i::SmiValuesAre31Bits() ? kSigned31 : kSigned32;
 }
 
 BitsetType::bitset BitsetType::UnsignedSmall() {
   return i::SmiValuesAre31Bits() ? kUnsigned30 : kUnsigned31;
 }
 
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8