[Bug tree-optimization/115896] Failure to optimize shift+compare involving constants to and+compare

[gabravier at gmail dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115896

--- Comment #3 from Gabriel Ravier <gabravier at gmail dot com> ---
(PS: LLVM seems to do the `(cst0 << a) == cst1` transformation including when
`cst1 == 0` since 59939acd2684708a1c617f9e42b2206956804bb6)