Substitution for type variables in mirrors on instantiated generics.

tests/lib/lib.status

Index: tests/lib/lib.status
diff --git a/tests/lib/lib.status b/tests/lib/lib.status
index 9d4506b94fb71f4dba76483b837321be1bd8bdfb..4c5fc9be83b83ca134bc576c51fa45b8d2ae1710 100644
--- a/tests/lib/lib.status
+++ b/tests/lib/lib.status
@@ -156,10 +156,7 @@ mirrors/typedef_test/01: Fail, OK # Incorrect dart2js behavior.
 mirrors/closures_test/01: Fail, OK # Incorrect dart2js behavior.
 
 mirrors/constructor_kinds_test: RuntimeError # Issue 13798
-mirrors/generics_substitution_test: RuntimeError # Issue 13808
 mirrors/generic_function_typedef_test: RuntimeError # Issue 12282
-mirrors/generic_mixin_applications_test: RuntimeError # Issue 12282
-mirrors/type_argument_is_type_variable_test: RuntimeError # Issue 12282
 
 [ $compiler == none && $runtime == drt ]
 async/timer_isolate_test: Skip # See Issue 4997
@@ -210,10 +207,7 @@ mirrors/mixin_test/01: Fail # Issue 13719: Please triage this failure.
 mirrors/typedef_test/01: Fail # Issue 13719: Please triage this failure.
 
 mirrors/constructor_kinds_test: RuntimeError # Issue 13798
-mirrors/generics_substitution_test: RuntimeError # Issue 13808
 mirrors/generic_function_typedef_test: RuntimeError # Issue 12282
-mirrors/generic_mixin_applications_test: RuntimeError # Issue 12282
-mirrors/type_argument_is_type_variable_test: RuntimeError # Issue 12282
 
 [ $compiler == none && $runtime == dartium ]
 async/run_async5_test: Pass, Timeout # Issue 13719: Please triage this failure.