filelog: cmp: don't read data if hashes are identical (issue2273)
filelog.renamed() is an expensive call as it reads the filelog if p1 == nullid.
It's more efficient to first compute the hash, and to bail early if
the computed hash is the same as the stored nodeid.
'samehashes' variable is not strictly necessary, but helps for comprehension.
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'p/1/(add addremove annotate blame archive \
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