Simplified the implementation of lgamma, erf, and erfc
Simplified the implementation of lgamma, erf, and erfc

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