[Bug rtl-optimization/84660] Combine doing wrong optimization for 64 bits with SHIFT_COUNT_TRUNCATED target

[npickito at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84660

--- Comment #7 from Kito Cheng <npickito at gmail dot com> ---
Hi Jim:

Thanks your update, we'll test that again, btw, we can also test on x86-64 and
aarch64 if you have no time to test other target.