[Bug bootstrap/58509] [4.9 regression] ICE in calc_dfs_tree, at dominance.c:397 during Ada runtime build

[mikpelinux at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58509

--- Comment #4 from Mikael Pettersson <mikpelinux at gmail dot com> ---
Eric's patch fixes this bootstrap problem for me on sparc64-linux.