[HIPIFY] Initial support of translation to ROCm

+ Option '-roc' is added to translate to ROCm instead of HIP
+ Update hipification mechanism accordingly
+ Populate all translation maps with additional field for ROCm identifiers
+ There are 4 degrees of CUDA support now: full support, only by HIP, only by ROCm, unsupported

hipify-clang/src/ArgParse.cpp

@@ -7,6 +7,11 @@ cl::opt<std::string> OutputFilename("o",
   cl::value_desc("filename"),
   cl::cat(ToolTemplateCategory));
 
+cl::opt <bool> TranslateToRoc("roc",
+  cl::desc("Translate to roc instead of hip where it is possible"),
+  cl::value_desc("roc"),
+  cl::cat(ToolTemplateCategory));
+
 cl::opt<bool> Inplace("inplace",
   cl::desc("Modify input file inplace, replacing input with hipified output, save backup in .prehip file"),
   cl::value_desc("inplace"),