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### Description
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Support AVX for i686.
There was an existing work-around for windows. Added the more generic
architecture comparison to also apply for linux.
### Reference issue
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Fixes #2991.
Closes #2991
See merge request libeigen/eigen!2037
(cherry picked from commit 8e60d4173c)
Eigen is a C++ template library for linear algebra: matrices, vectors, numerical solvers, and related algorithms.
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