[Bug middle-end/112629] Missed-optimization: constant << (b + signed_constant)

[goon.pri.low at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=112629

--- Comment #3 from gooncreeper <goon.pri.low at gmail dot com> ---
This optimization could also be performed for unsigned integers if we know they
won't overflow in the optimization.