phases: use revision number in `_pushdiscoveryphase` We now reach our target checkpoint in terms of rev-num conversion. The `_pushdiscoveryphase` function is now performing graph computation based on revision number only. Avoiding repeated conversion from node-id to rev-num. See previous changeset updated `new_heads` for rationnal. Again, time saved in the 100 milliseconds order of magnitude for the mozilla-try benchmark I have been using. However, wow that the logic is done using revision number, we can look into having better logic in the next changesets, which will provide a much bigger speedup.

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  $ hg init repo

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  $ cd repo

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  $ "$PYTHON" -c 'open("a", "wb").write(b"confuse str.splitlines\nembedded\rnewline\n")'

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  $ hg ci -Ama -d '1 0'

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  adding a

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  $ echo clean diff >> a

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  $ hg ci -mb -d '2 0'

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  $ hg diff -r0 -r1

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  diff -r 107ba6f817b5 -r 310ce7989cdc a

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  --- a/a	Thu Jan 01 00:00:01 1970 +0000

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  +++ b/a	Thu Jan 01 00:00:02 1970 +0000

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  @@ -1,2 +1,3 @@

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   confuse str.splitlines

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   embedded\r (no-eol) (esc)

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  newline

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  +clean diff

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