[eigen] Totally missing /O2 for MSVC-Compiler

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Hi Folks,

you can imagine my surprise, when I was looking at my own CDash Entry: ALL GREEN. All tests compile and run. After a first period of confused joy my attention was going towards the timings. DARK RED! IMHO.
Hey Gael: pipol6 are dead slow too....

The reason is, that for compiler other then gcc NO OPTIMIZATION is set.
That is the difference, because all automated tests pass and my handmade test don't want to compile.

We were blind all the time!
All the MSVC problems are general and probably quite old.


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