Environment variable for spoofing gfx device name. (#2496)
Environment variable for spoofing gfx device name. (#2496)

* Environment variable for spoofing gfx device name.
1. adds MIOPEN_DEBUG_GCNARCH
* env rename + move to device_name.hpp
ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen,ROCmSoftwarePlatform/MIOpen