[HIPIFY] Add device functions support

+ Add a corresponding matcher cudaDeviceFuncCall to match only (__device__ or __global__) and not __host__ functions.
+ Add a corresponding device functions mapping:
  only unsupported are listed, cause supported are exactly the same as of CUDA and do not need transformation;
  make FindAndReplace for device functions separated from host API calls.
+ Add a test to distinguish device functions and user-defined.


[ROCm/hip commit: 6602fadc16]

projects/hip/hipify-clang/src/Statistics.cpp

@@ -57,6 +57,7 @@ const char *counterNames[NUM_CONV_TYPES] = {
   "complex", // CONV_COMPLEX
   "library", // CONV_LIB_FUNC
   "device_library", // CONV_LIB_DEVICE_FUNC
+  "device_function", // CONV_DEVICE_FUNC
   "include", // CONV_INCLUDE
   "include_cuda_main_header", // CONV_INCLUDE_CUDA_MAIN_H
   "type", // CONV_TYPE