fix bug 475: .exp() now returns +inf when overflow occurs (SSE)
fix bug 475: .exp() now returns +inf when overflow occurs (SSE)

pasuka/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,toastedcrumpets/eigen,Zefz/eigen,toastedcrumpets/eigen,TSC21/Eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,toastedcrumpets/eigen,pasuka/eigen,toastedcrumpets/eigen,ritsu1228/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,TSC21/Eigen,Zefz/eigen,Zefz/eigen,ritsu1228/eigen,TSC21/Eigen,Zefz/eigen,TSC21/Eigen,ritsu1228/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ritsu1228/eigen