Allow summary type inference to infer a type of `void`.

pkg/analyzer/lib/src/summary/link.dart

Index: pkg/analyzer/lib/src/summary/link.dart
diff --git a/pkg/analyzer/lib/src/summary/link.dart b/pkg/analyzer/lib/src/summary/link.dart
index 6c1b64aa2b02825a5ec02024636217a4774a8594..eb440e0274f71517d0a561cd6630742a4ab3ae15 100644
--- a/pkg/analyzer/lib/src/summary/link.dart
+++ b/pkg/analyzer/lib/src/summary/link.dart
@@ -247,7 +247,7 @@ EntityRefBuilder _createLinkedType(
 }
 
 DartType _dynamicIfNull(DartType type) {
-  if (type == null || type.isBottom || type.isDartCoreNull || type.isVoid) {
+  if (type == null || type.isBottom || type.isDartCoreNull) {
     return DynamicTypeImpl.instance;
   }
   return type;