[Bug sanitizer/70683] [7 Regression] -fcompare-debug bug with -fsanitize=address

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70683

--- Comment #3 from Richard Biener <rguenth at gcc dot gnu.org> ---
Yes, iterative_hash_expr needs to match operand_equal_p (I'd add checking bits
to operand_equal_p that makes sure equal trees hash the same).