Fix assign vectorization logic with respect to fixed outer-stride
Fix assign vectorization logic with respect to fixed outer-stride

ritsu1228/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,ritsu1228/eigen,ritsu1228/eigen,pasuka/eigen,ritsu1228/eigen,ritsu1228/eigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen,pasuka/eigen,ROCmSoftwarePlatform/hipeigen