Use __halves2half2 to avoid conversion conflicts btw Eigen::Half and half2
Use __halves2half2 to avoid conversion conflicts btw Eigen::Half and half2

ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen,ROCmSoftwarePlatform/hipeigen