New jit log

Closed Bitbucket Importer requested to merge branch/new-jit-log into branch/default

Created originally on Bitbucket by plan_rich (Richard Plangger)

This change set holds the new (non plain text) logging facility to be viewed on

It is working reasonably well, with no overhead when disabled (the default). To enable it there are several ways:

JITLOG=filename pypy ... pypy -m vmprof --jitlog

This makes bug reporting much easier for pypy users since they only have to send the link of the profile on

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