Automatic PGO - Initial implementation (1/N)

[Diego Novillo]

Sure.  Sorry about that.

I need to think about phabricator. I've been burnt by these web-based
review tools before, so I'm allegic to them. They generally do not
handle e-mail very well (or at all, like rietveld). How is phabricator
in that area?  Anyway, I don't want to digress too much. I'll read on
it.

I'm attaching the patch for now.


Thanks.  Diego.
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