Add popcount, clz, ctz primitives #94
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Closes #92.
Implement primops for popcount, clz (count leading zeros) and ctz (count trailing zeros).
They use builtins for MSVC, GCC and Clang. The default implementation has
#ifs for GCC and Clang, since those are the most common compilers, to avoid having to repeat those checks for the different platforms.