[Bug tree-optimization/107090] [aarch64] sequence logic should be combined with mul and umulh

[zhongyunde at huawei dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107090

--- Comment #2 from vfdff <zhongyunde at huawei dot com> ---
Thanks for your suggestion.

As the combine pass can't address more than 4 sequence insns, which pass may be
more suitable to match the huge pattern after fixing the 1st issue.