[Bug sanitizer/63520] ICE: in get_biv_step, at loop-iv.c:824 with -fsanitize=undefined on ppc64

[trippels at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63520

--- Comment #10 from Markus Trippelsdorf <trippels at gcc dot gnu.org> ---
(In reply to Marek Polacek from comment #9)
> Maybe dup of PR63879.

PR63879 segfaults here:
in tree_nop_conversion_p (outer_type=0x3fffaf4c3720, inner_type=0x3fffaf2807e0)
at ../../gcc/gcc/tree.c:11685

So it looks different. I will open a new bug for the issue of 
comment 6 & 8. It has nothing to do with Jakub's patch.