BenchTimer: avoid warning about symbol redefinition on win32, and include <Eigen/Core> (required to compile)
BenchTimer: avoid warning about symbol redefinition on win32, and include <Eigen/Core> (required to compile)

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