[Bug target/68647] __builtin_popcountll doesn't generate popcnt instructions when targeting -mpopcnt on x86_32

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68647

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #3)
> Sorry Uros, forgot to assign this to myself before I've started to work on
> it.

Ah, nice. I have a target-dependent patch for this, but I agree that generic
solution is better.