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Enable fill_n and memset optimizations for construction and assignment

Charles Schlosserrequested to merge
chuckyschluz/eigen-chucky:more_fill into master

Reference issue

What does this implement/fix?

Currently, Eigen optimizes xpr.setConstant(val) and xpr.setZero() with fill_n and memset as appropriate. This MR enables the same optimization for expressive code like MatrixXf A = MatrixXf::Zero(rows, cols), which is semantically equivalent to MatrixXf A(rows, cols); A.setZero(); This MR intercepts assignments where the right hand side is either ConstantReturnType or ZeroReturnType, resizes the left hand side if needed, and uses the setConstant and setZero logic.

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