[Bug target/114224] popcount RTL cost seems wrong with cssc

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114224

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |ASSIGNED
           Assignee|unassigned at gcc dot gnu.org      |pinskia at gcc dot gnu.org
   Last reconfirmed|                            |2024-03-04
     Ever confirmed|0                           |1

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
Interesting:
```
int h1(unsigned a)
{
        return  __builtin_popcountg(a) == 1;
}
```
works.


Anyways I will be adding POPCOUNT's rtl cost here.

We don't even handle POPCOUNT for vector modes either ...