[Bug middle-end/105253] __popcountdi2 calls generated in kernel code with gcc12

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105253

--- Comment #5 from Richard Biener <rguenth at gcc dot gnu.org> ---
We're not checking for an optab here (that's on purpose IIRC).  The code using
the niter analysis result is responsible to do cost checking.  The builtin
is recognized via number_of_iterations_popcount.

If you use GCC you have to link against libgcc.a at least.