[eigen] great performance with eigen 3.3

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Just to let you know that I've recently given a shot to eigen 3.3 and it works great (as compared to 3.2).
I have an old 2010 macbook pro (so no avx nor fma) but my finite element assembly and solution routines are almost twice as fast. 
I use a lot of matrix products, outer products (often with constant expressions and outer of vectors) and += assignments. 
Great job!
Thanks to the community.

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