Re: [PATCH v2 2/2] convert.c: stream and fast search for binary

> From: Torsten Bögershausen <tboegi@web.de>
>
> When statistics are done for the autocrlf handling, the search in
> the content can be stopped, if e.g
> - a search for binary is done, and a NUL character is found
> - a search for CRLF is done, and the first CRLF is found.
>
> Similar when statistics for binary vs non-binary are gathered:
> Whenever a lone CR or NUL is found, the search can be aborted.
>
> When checking out files in "auto" mode, any file that has a "lone CR"
> or a CRLF will not be converted, so the search can be aborted early.
>
> Add the new bit, CONVERT_STAT_BITS_ANY_CR,
> which is set for either lone CR or CRLF.
>
> Many binary files have a NUL very early and it is often not necessary
> to load the whole content of a file or blob into memory.
>
> Split gather_stats() into gather_all_stats() and gather_stats_partly()
> to do a streaming handling for blobs and files in the worktree.