* ipa-prop.h (ipa_ancestor_jf_data): Update ocmment.
* ipa-prop.c (ipa_set_jf_known_type): Return early when
not devirtualizing.
(ipa_set_ancestor_jf): Set type to NULL hwen it is not preserved;
do more sanity checks.
(detect_type_change): Return true when giving up early.
(compute_complex_assign_jump_func): Fix type parameter of
ipa_set_ancestor_jf.
(compute_complex_ancestor_jump_func): Likewise.
(update_jump_functions_after_inlining): Fix updating of
ancestor function.
* ipa-cp.c (ipa_get_jf_ancestor_result): Be ready for type
to be NULL.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@207877 138bc75d-0d04-0410-961f-82ee72b054a4