[PATCH] Binheap performance improvements

[Aliaksandr Valialkin]

Hi there.

Could you look into this pull request:
https://github.com/varnish/Varnish-Cache/pull/1 ?

I attached patches from the pull request. The first two are essential,
while the last two are just small cleanups. I could merge them with
the second patch, but didn't do this, since the corresponding commits
were already published on github and history rewrites are considered
bad :)
These patches should improve Varnish performance when its cache don't fit RAM.

-- 
Best Regards,

Aliaksandr
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