[Bug target/116445] gcc.target/arm/unsigned-extend-2.c on Cortex-M55 and misses possible Cortex-M optimization

[saurabh.jha at arm dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116445

--- Comment #1 from Saurabh Jha <saurabh.jha at arm dot com> ---
I am picking this up. I am having trouble assigning myself so commenting here
for now.