add test case beyond 2^23
add test case beyond 2^23

tingxingdong/rocFFT-1,tingxingdong/rocFFT-1,ROCmSoftwarePlatform/rocFFT,bragadeesh/rocFFT,ROCmSoftwarePlatform/rocFFT,bragadeesh/rocFFT,bragadeesh/rocFFT,ROCmSoftwarePlatform/rocFFT,tingxingdong/rocFFT-1,ROCmSoftwarePlatform/rocFFT