Compute bounds of type variables.

pkg/front_end/lib/src/fasta/kernel/kernel_target.dart

Index: pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
diff --git a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
index ec281c98baa0e8cdb193eb18349b732e7e28dd0c..868ee79529a956c8f2c39a924d7ba5db0507babd 100644
--- a/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
+++ b/pkg/front_end/lib/src/fasta/kernel/kernel_target.dart
@@ -257,6 +257,7 @@ class KernelTarget extends TargetImplementation {
       installDefaultSupertypes(sourceClasses);
       installDefaultConstructors(sourceClasses);
       loader.resolveConstructors();
+      loader.finishTypeVariables(objectClassBuilder);
       program = link(new List<Library>.from(loader.libraries));
       if (uri == null) return program;
       return await writeLinkedProgram(uri, program, isFullProgram: false);