Make finalization of recursive function types more robust, especially since

tests/language/language_kernel.status

Index: tests/language/language_kernel.status
diff --git a/tests/language/language_kernel.status b/tests/language/language_kernel.status
index 2b0ffeb27fc2ce7c8ca08b775000c4d69074e438..ea7eaaeb9ea90f0b2a75b409e38483e1f2f512fc 100644
--- a/tests/language/language_kernel.status
+++ b/tests/language/language_kernel.status
@@ -88,11 +88,6 @@ cyclic_constructor_test/01: MissingCompileTimeError
 cyclic_type_test/00: RuntimeError
 cyclic_type_test/01: RuntimeError
 cyclic_type_test/03: RuntimeError
-cyclic_type_variable_test/01: Crash
-cyclic_type_variable_test/02: Crash
-cyclic_type_variable_test/03: Crash
-cyclic_type_variable_test/04: Crash
-cyclic_type_variable_test/none: Crash
 cyclic_typedef_test/01: MissingCompileTimeError
 cyclic_typedef_test/02: MissingCompileTimeError
 cyclic_typedef_test/03: MissingCompileTimeError
@@ -406,7 +401,6 @@ vm/optimized_stacktrace_test: Skip # Issue 28788
 [ $compiler == dartk && $mode == debug ]
 constructor_duplicate_initializers_test/03: Crash
 deopt_inlined_function_lazy_test: Skip
-function_malformed_result_type_test: Crash
 hello_dart_test: Crash  # error: expected: cls.is_type_finalized()
 not_enough_positional_arguments_test/02: Crash  # Dartk Issue 28301
 not_enough_positional_arguments_test/05: Crash  # Dartk Issue 28301
@@ -419,7 +413,6 @@ ref_before_declaration_test/05: Crash
 ref_before_declaration_test/06: Crash
 ref_before_declaration_test/07: Crash
 ref_before_declaration_test/none: Crash
-regress_29025_test: Crash
 try_catch_syntax_test/05: Crash
 vm/lazy_deopt_vm_test: Crash