[Bug tree-optimization/122615] `x&a ? (x&~a): (x|a)` -> x ^ a when popcount(a) == 1

[dbarboza at ventanamicro dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122615

--- Comment #3 from Daniel Henrique Barboza <dbarboza at ventanamicro dot com> 
---
Hi,

I'll fix this bug with the same match.pd pattern I'm using in
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=122616.