[async-iteration] implement Async-from-Sync Iterator

src/builtins/builtins.h

Index: src/builtins/builtins.h
diff --git a/src/builtins/builtins.h b/src/builtins/builtins.h
index f23bfd13cdc34f61fb0d266014db6b1cfceb2ff6..12b7ff5cde481894f3c630a367f5159df538ca92 100644
--- a/src/builtins/builtins.h
+++ b/src/builtins/builtins.h
@@ -819,7 +819,18 @@ class Isolate;
   CPP(TypedArrayPrototypeCopyWithin)                                           \
                                                                                \
   /* Wasm */                                                                   \
-  TFS(WasmStackGuard, BUILTIN, kNoExtraICState, WasmStackGuard, 1)
+  TFS(WasmStackGuard, BUILTIN, kNoExtraICState, WasmStackGuard, 1)             \
+                                                                               \
+  /* Async-from-Sync Iterator */                                               \
+                                                                               \
+  /* %AsyncFromSyncIteratorPrototype% */                                       \
+  /* (proposal-async-iteration/#sec-%asyncfromsynciteratorprototype%-object)*/ \
+  TFJ(AsyncFromSyncIteratorPrototypeNext, 1)                                   \
+  TFJ(AsyncFromSyncIteratorPrototypeThrow, 1)                                  \
+  TFJ(AsyncFromSyncIteratorPrototypeReturn, 1)                                 \
+                                                                               \
+  /* proposal-async-iteration/#sec-async-iterator-value-unwrap-functions */    \
+  TFJ(AsyncIteratorValueUnwrap, 1)
 
 #define IGNORE_BUILTIN(...)