[Bug rtl-optimization/78120] [6/7 Regression] If conversion no longer performed

[jgreenhalgh at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78120

--- Comment #9 from James Greenhalgh <jgreenhalgh at gcc dot gnu.org> ---
I haven't had a chance to bootstrap or benchmark it, but your patch looks
reasonable to me.