Remove unnecessary scale check in set_ref.

Scale check has been done in read_inter_block_mode_info.

Change-Id: I6c86f93bd579109ed30ff13a04a30e35f5ae6fc5
Rename highbitdepth functions to use highbd prefix

Uses highbd_ prefix convention consistently.

Change-Id: I58f7f799a7ff8e32701bcd71c955bcf1cdd4581e
Remove unnecessary code.

Function will jump to error handler when ref buffer is corrupted.
So "xd->corrupted |= ref_buffer->buf->corrupted;" is useless.

Change-Id: I35353a0637ad0dbb682454e040ef69fa68280bfa
Merge "Rename highbitdepth functions to use highbd prefix"
Merge "Remove unnecessary scale check in set_ref."
Merge "Remove unnecessary code."