[Bug rtl-optimization/59278] combine does not replace matched insn

[olegendo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=59278

--- Comment #3 from Oleg Endo <olegendo at gcc dot gnu.org> ---
Fixed for 5.0.  I'd like to leave the PR open for a while, though.  In case
there are any fallouts.