Fix for summarizing typedef typed parameters.

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

Index: pkg/analyzer/lib/src/summary/summarize_elements.dart
diff --git a/pkg/analyzer/lib/src/summary/summarize_elements.dart b/pkg/analyzer/lib/src/summary/summarize_elements.dart
index c30393678c034d307bdea3e6d0acbdf3ff8e6778..3f39a38528451162b3ff90d9392c92cb83f94799 100644
--- a/pkg/analyzer/lib/src/summary/summarize_elements.dart
+++ b/pkg/analyzer/lib/src/summary/summarize_elements.dart
@@ -689,7 +689,7 @@ class _CompilationUnitSerializer {
         b.inferredTypeSlot = storeInferredType(type, context);
       }
     } else {
-      if (type is FunctionType) {
+      if (type is FunctionType && type.element.isSynthetic) {
         b.isFunctionTyped = true;
         b.type = serializeTypeRef(type.returnType, parameter);
         b.parameters = type.parameters