diff.c: do not use a separate "size cache".
diff_filespec has a slot to record the size of the data already,
so make use of it instead of a separate size cache.
Signed-off-by: NJunio C Hamano <junkio@cox.net>
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diff_filespec has a slot to record the size of the data already,
so make use of it instead of a separate size cache.
Signed-off-by: NJunio C Hamano <junkio@cox.net>