Constant core::arch::x86_64::_SIDD_CMP_RANGES

pub const _SIDD_CMP_RANGES: i32 = 0b0000_0100;

This is supported on (non-crate feature miri-test-libstd or test or doctest) and x86-64 only.

For each character in a, determine if b[0] <= c <= b[1] or b[1] <= c <= b[2]...