Make gimple_goto_set_dest require a gimple_goto
This corresponds to:
[PATCH 59/89] Make gimple_goto_set_dest require a gimple_goto
https://gcc.gnu.org/ml/gcc-patches/2014-04/msg01193.html
from the original 89-patch kit
That earlier patch was approved by Jeff:
> OK once prerequisites have gone in.
in https://gcc.gnu.org/ml/gcc-patches/2014-05/msg00815.html
gcc/
* gimple.h (gimple_goto_set_dest): Require a gimple_goto.
* tree-cfg.c (factor_computed_gotos): Add checked cast to
gimple_goto.
(cleanup_dead_labels): Likewise.