Constant rustc_middle::mir::interpret::allocation::MAX_HASHED_BUFFER_LEN

const MAX_HASHED_BUFFER_LEN: usize = 2 * MAX_BYTES_TO_HASH; // 128usize

This is the maximum size (in bytes) for which a buffer will be fully hashed, when interning. Otherwise, it will be partially hashed in 2 slices, requiring at least 2 MAX_BYTES_TO_HASH bytes.