* Use inst_block instead of pp_block where possible * Remove unused is_block_gap method * Remove ProgramOrder trait It only has a single implementation * Rename Layout::cmp to pp_cmp to distinguish it from Ord::cmp * Make pp_block non-generic * Use rpo_cmp_block instead of rpo_cmp in the verifier * Remove ProgramPoint * Rename ExpandedProgramPoint to ProgramPoint * Remove From<ValueDef> for ProgramPoint impl