[CostModel][X86] Add CostKinds handling for ctpop ops

This was achieved with an updated version of the 'cost-tables vs llvm-mca' script D103695 (although it still struggles with avx512 predicate numbers which had to be done manually)

Some of the pre-AVX values still aren't great - atom/slm worst case numbers for ctpop expansion really affect these (especially throughput/latency), so we need to clean them up in a more consistent way - its a pity we don't have models for more older cpus (merom/nehalem etc.) as other examples.