Use intrinsics when available

Use intrinsics from the llvmint package.

[x] parallel_bits_deposit/extract => bmi_pdep_32/64 and bmi_pext_32/64 (BMI 2.0),
[x] leading_zeros => LLVM's __lzcnt16/32/u32/64/u64 (blocked on https://github.com/huonw/llvmint/issues/3) (BMI 1.0, ABM),
[x] count_ones => LLVM's _popcnt_32/u32/64/u64 (blocked on https://github.com/huonw/llvmint/issues/4) (SSE4.2, ABM),
[x] trailing_zeros => tzcnt (BMI 1.0), (blocked on https://github.com/huonw/llvmint/issues/5 and https://github.com/rust-lang/rust/issues/34382)
[x] reset_bits_geq(starting bit) => bmi_bzhi_32/64 (BMI 1.0)
[x] reset_least_significant_one => BLSR (BMI 1.0)
[x] Logical and not ~x & y (BMI 1.0) (TODO: implement algorithm)
[x] Bit field extract (with register): (src >> start) & ((1 << len)-1) => bmi_bextr_32/64 (BMI 1.0)
[x] isolate_least_significant_one: Extract lowest set isolated bit: x & -x (blocked on "not available in llvmint) (BMI 1.0)
[x] mask_trailing_zeros_and_least_significant_one: Get mask up to lowest set bit: x ^ (x - 1) (blocked on "not available in llvmint") (BMI 1.0)

gnzlbg / bitwise