Re: [PATCH] sha1_name: remove ONELINE_SEEN bit

> 28a4d94044 ("object name: introduce ':/<oneline prefix>' notation",
> 2007-02-24) started using its own bit from object->flags to mark
> commits used while parsing the ":/token" extended SHA-1 syntax to
> name a commit temporarily, and this was kept even when f7bff00314
> ("sha1_name.c: fix parsing of ":/token" syntax", 2010-08-02) found
> and fixed a bug in its implementation.
> 
> The use of that flag bit, however, is limited to a single function,
> get_sha1_oneline(), which first sets it for the commits sitting at
> the tips of refs, uses the bit to avoid duplicate traversal while
> walking the history, and then cleans the bit from all commits it
> walked.
> 
> Which is exactly what the general-purpose TMP_MARK bit meant to be
> used for isolated case was invented for.  Replace ONELINE_SEEN with
> TMP_MARK and retire the former.