Constant MAX_SIMD_LANES

pub const MAX_SIMD_LANES: u64 = _; // 32_768u64

The maximum supported number of lanes in a SIMD vector.

This value is selected based on backend support:

• LLVM does not appear to have a vector width limit.
• Cranelift stores the base-2 log of the lane count in a 4 bit integer.