[MERGE] working tree stat cache updating during commit.

[Robert Collins]

If commit sees a new file content, it should update the stat cache. This
patch allows it to do that by providing a tree-supplied detail back to
the to caller of record_entry_contents during commit, which is then
passed back to the tree.

I haven't profiled this closely yet, but it should be lightweight as few
files are modified in most commits, and it is a precursor to status not
generating a sha1 when it does not need to. Probably diff() etc will
also want to do this - I'll follow up with that separately.

-Rob

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