Macro. Serialization for MacroExecutionResult(s).

Bug: dart-lang/language#3877
Change-Id: I7897bdf27a17d004b810409ad9c2ac76bb8677b3
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/369842
Commit-Queue: Konstantin Shcheglov <[email protected]>
Reviewed-by: Brian Wilkerson <[email protected]>
Reviewed-by: Phil Quitslund <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/summary2/link.dart

@@ -74,6 +74,7 @@ class Linker {
 
   Linker(this.elementFactory, this.macroExecutor) {
     macroDeclarationBuilder = DeclarationBuilder(
+      elementFactory: elementFactory,
       nodeOfElement: (element) => elementNodes[element],
     );
   }