https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95638
--- Comment #6 from bin cheng ---
We call graphds_scc twice to break alias dependence, with alias dependence
edges skipped in the second call. The code (both before and after
r10-7184-ge4e9a59105a81cdd6c1328b0a5ed9fe4cc82840e) tries to rectify post order
information after the second call, however it never gets it right. Actually I
don't think it can be easily rectified (if possible).
Will test another patch which records/restores post order information for the
second call.