[llvm] [SDag][ARM][RISCV] Allow lowering CTPOP into a libcall (PR #101786)

[Sergei Barannikov via llvm-commits]

s-barannikov wrote:

Some interesting discussions for a similar gcc bug(?):
https://bugzilla.kernel.org/show_bug.cgi?id=200671
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105253


https://github.com/llvm/llvm-project/pull/101786