perf.haskell.org’s list of branches got more useful

[Joachim Breitner]

Hi,

the list of branches on https://perf.haskell.org/ghc got more useful.
It now shows the difference from the branch head to the merge base¹,
which should roughly exhibit the performance change that would be
caused by merging the branch into master.

If the branch head or the merge base have not been measured (e.g.
because the build failed), the display might be a bit confusing. Same
with branches that often merge or cherry-pick from master. But in the
common case of a linear, possibly rebased, feature branch, it should
work fine.

Greetings,
Joachim

¹ Which, I think, is the youngest commit also reachable from master. Or
something like that. Consult "man git merge-base" if you want a little
mind teaser.

-- 
Joachim “nomeata” Breitner
  mail at joachim-breitner.de • https://www.joachim-breitner.de/
  XMPP: nomeata at joachim-breitner.de • OpenPGP-Key: 0xF0FBF51F
  Debian Developer: nomeata at debian.org

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