Fix ignore on FutureOr

pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart

Index: pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
diff --git a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
index 9eba1b2c3ad6fb79a9bfcc0a2b007cc5ea2579c6..b326b6614a73d656ae10b03508a8768b51a3c315 100644
--- a/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
+++ b/pkg/dev_compiler/tool/input_sdk/private/ddc_runtime/operations.dart
@@ -470,8 +470,16 @@ final _ignoreTypeFailure = JS(
       // TODO(vsm): Remove this hack ...
       // This is primarily due to the lack of generic methods,
       // but we need to triage all the types.
+    if ($_isFutureOr(type)) {
+      // Ignore if we would ignore either side of union.
+      let typeArg = $getGenericArgs(type)[0];
+      let typeFuture = ${getGenericClass(Future)}(typeArg);
+      return $_ignoreTypeFailure(actual, typeFuture) ||
+        $_ignoreTypeFailure(actual, typeArg);
+    }
+
     if (!!$isSubtype(type, $Iterable) && !!$isSubtype(actual, $Iterable) ||
-        !!$isSubtype(type, $FutureOr) && !!$isSubtype(actual, $Future) ||
+        !!$isSubtype(type, $Future) && !!$isSubtype(actual, $Future) ||
         !!$isSubtype(type, $Map) && !!$isSubtype(actual, $Map) ||
         $isFunctionType(type) && $isFunctionType(actual) ||
         !!$isSubtype(type, $Stream) && !!$isSubtype(actual, $Stream) ||