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[GOOGLE] Refactor AutoFDO


This patch refactors AutoFDO to use:

1. C++ to rewrite the whole thing.
2. Use tree instead of hashtable to represent the profile.
3. Make AutoFDO standalone: keep changes to other modules minimum.

Bootstrapped and passed regression test and benchmark test.

OK for google-4_8 branch?

Thanks,
Dehao

http://codereview.appspot.com/12079043

Attachment: patch.txt
Description: Text document


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