Treat generic method parameters as dynamic in all contexts in the VM (fixes #27460)

tests/language/language.status

Index: tests/language/language.status
diff --git a/tests/language/language.status b/tests/language/language.status
index 001cf0ee9c19f815e44459c5cd91b9bd00ae6525..4e3485bd77c42bbd30b96ceedf29edfd9f5a3fdf 100644
--- a/tests/language/language.status
+++ b/tests/language/language.status
@@ -7,6 +7,7 @@
 
 [ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) ]
 tearoff_constructor_basic_test: Skip # Crashes in checked mode -- hausner investigating
+generic_methods_type_expression_test: RuntimeError # Issue 25869
 
 # These tests are skipped in the VM because it has "--supermixin"
 # functionality enabled unconditionally.  The tests should be removed
@@ -45,14 +46,14 @@ async_star_regression_2238_test: CompileTimeError, RuntimeError # drt only runti
 async_star_cancel_while_paused_test: RuntimeError
 
 [ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) && $checked ]
-# The generic functions tests fail in checked mode because the parsed type parameters
-# are ignored.
-generic_methods_function_type_test: RuntimeError # Issue 25869
-generic_methods_test: RuntimeError # Issue 25869
-generic_methods_new_test: RuntimeError # Issue 25869
-generic_local_functions_test: RuntimeError # Issue 25869
-generic_functions_test: RuntimeError # Issue 25869
-generic_methods_generic_function_parameter_test: RuntimeError # Issue 25869
+# These generic functions tests pass for the wrong reason in checked mode,
+# because the parsed type parameters are mapped to dynamic type.
+generic_methods_function_type_test: Pass # Issue 25869
+generic_methods_test: Pass # Issue 25869
+generic_methods_new_test: Pass # Issue 25869
+generic_local_functions_test: Pass # Issue 25869
+generic_functions_test: Pass # Issue 25869
+generic_methods_generic_function_parameter_test: Pass # Issue 25869
 
 [ ($compiler == none || $compiler == precompiler || $compiler == dart2app || $compiler == dart2appjit) && ($runtime == vm || $runtime == dart_precompiled || $runtime == dart_app) ]