Fixing csrsort bug (#342)
Fixing csrsort bug (#342)

* experiment on sort and rocprim ...

* reverting experiment on coosort

* allowing zero buffer

* fix crazy amount of unnecessary buffer memory
ROCmSoftwarePlatform/rocSPARSE,ROCmSoftwarePlatform/rocSPARSE,ROCmSoftwarePlatform/rocSPARSE,ROCmSoftwarePlatform/rocSPARSE