Issue 28580. Relax instantiate to bounds.

pkg/analyzer/lib/src/generated/resolver.dart

Index: pkg/analyzer/lib/src/generated/resolver.dart
diff --git a/pkg/analyzer/lib/src/generated/resolver.dart b/pkg/analyzer/lib/src/generated/resolver.dart
index a1979d0bd6e23cc4c9ad322a8f35d55da564924a..ef53702ce7aeb2d78c5183bb02855315eb971787 100644
--- a/pkg/analyzer/lib/src/generated/resolver.dart
+++ b/pkg/analyzer/lib/src/generated/resolver.dart
@@ -8700,7 +8700,7 @@ class TypeOverrideManager_TypeOverrideScope {
  * type aliases.
  */
 class TypeParameterBoundsResolver {
-  final TypeProvider typeProvider;
+  final TypeSystem typeSystem;
   final LibraryElement library;
   final Source source;
   final AnalysisErrorListener errorListener;
@@ -8709,7 +8709,7 @@ class TypeParameterBoundsResolver {
   TypeNameResolver typeNameResolver = null;
 
   TypeParameterBoundsResolver(
-      this.typeProvider, this.library, this.source, this.errorListener);
+      this.typeSystem, this.library, this.source, this.errorListener);
 
   /**
    * Resolve bounds of type parameters of classes, class and function type
@@ -8763,8 +8763,8 @@ class TypeParameterBoundsResolver {
               libraryScope ??= new LibraryScope(library);
               typeParametersScope ??= createTypeParametersScope();
               typeNameResolver ??= new TypeNameResolver(
-                  new TypeSystemImpl(typeProvider),
-                  typeProvider,
+                  typeSystem,
+                  typeSystem.typeProvider,
                   library,
                   source,
                   errorListener);