Re: [PATCH 5/9] xdiff: split xrecord_t.ha into line_hash and minimal_perfect_hash

>
> From: Ezekiel Newren <ezekielnewren@gmail.com>
>
> The ha field is serving two different purposes, which makes the code
> harder to read. At first glance it looks like many places assume
> there could never be hash collisions between lines of the two input
> files. In reality, line_hash is used together with xdl_recmatch() to
> ensure correct comparisons of lines, even when collisions occur.
>
> To make this clearer, the old ha field has been split:
>   * line_hash: The straightforward hash of a line, requiring no
>     additional context.
>   * minimal_perfect_hash: Not a new concept, but now a separate
>     field. It comes from the classifier's general-purpose hash table,
>     which assigns each line a unique and minimal hash across the two
>     files.
>
> Signed-off-by: Ezekiel Newren <ezekielnewren@gmail.com>