wrapping shift: remove first bitmask and table

[hkBst]

        #[inline(always)]
        pub const fn wrapping_shl(self, rhs: u32) -> Self {
            // SAFETY: the masking by the bitsize of the type ensures that we do not shift
            // out of bounds
            unsafe {
                self.unchecked_shl(rhs & (Self::BITS - 1))
            }
        }

already does the bitmask, so it seems unnecessary here.

More context: internals.rust-lang.org/t/wrapping-shift-operator-code-doing-bitmasking-twice/23167

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