Tune cpuset macros to optimize cases when CPU_SETSIZE fits into single machine word. For example, it turns CPU_SET() into expected shift and OR, removing two extra shifts and additional index on memory access.
Tune cpuset macros to optimize cases when CPU_SETSIZE fits into single
machine word. For example, it turns CPU_SET() into expected shift and OR,
removing two extra shifts and additional index on memory access.

Generated code checked for kernel (optimized) and user-level (unoptimized)
cases with GCC and CLANG.

Reviewed by:	attilio
MFC after:	2 weeks

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