Created by: hong19860320

1. Move equal, not_equal, less_than, less_equal, greater_than, greater_equal, conditional_block, while, increment, lod_reset, read_from_array, write_to_array from arm to host.
2. Support picking kernels for the Ops which are defined in the sub block of the conditional_block/while op.
3. Fix the declaration of op kernels(including the data type and data layout).