Fine. Add tracking annotations for loadLibraryFunction and loadLibraryProvider.

Change-Id: I57104694025632a547010d9e3047e96d8f9bf00c
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/449500
Reviewed-by: Johnni Winther <[email protected]>
Commit-Queue: Konstantin Shcheglov <[email protected]>

Author: scheglov

pkg/analyzer/lib/src/dart/element/element.dart

@@ -5928,6 +5928,7 @@ class LibraryElementImpl extends ElementImpl
 
   /// The provider for the synthetic function `loadLibrary` that is defined
   /// for this library.
+  @trackedInternal
   late final LoadLibraryFunctionProvider loadLibraryProvider;
 
   String _name;
@@ -6271,6 +6272,7 @@ class LibraryElementImpl extends ElementImpl
   }
 
   @override
+  @trackedIndirectly
   TopLevelFunctionElementImpl get loadLibraryFunction {
     return loadLibraryProvider.getElement(this);
   }