FP16 for reduce/map/fft

...-rt/tensor_runtime/include/approxhpvm_img_runtime_utils.h

llvm/projects/hpvm-tensor-rt/tensor_runtime/include/debug.h

...hpvm-tensor-rt/tensor_runtime/include/functional/common.h

.../hpvm-tensor-rt/tensor_runtime/include/functional/map.cuh

...vm-tensor-rt/tensor_runtime/include/functional/reduce.cuh

...pvm-tensor-rt/tensor_runtime/include/img_tensor_runtime.h

llvm/projects/hpvm-tensor-rt/tensor_runtime/src/common.cpp

...s/hpvm-tensor-rt/tensor_runtime/src/img_tensor_runtime.cu

...ts/hpvm-tensor-rt/tensor_runtime/src/img_tensor_utils.cpp