[HIPIFY] option cuda-path might be used with '--' as well as with a single dash: '-'

+ Update README.md

tests/hipify-clang/lit.cfg

@@ -75,7 +75,7 @@ else:
     clang_arguments += " -isystem'%s'/samples/common/inc"
 clang_arguments += " -I'%s'/include"
 
-hipify_arguments = "-cuda-path='%s'"
+hipify_arguments = "--cuda-path='%s'"
 
 config.substitutions.append(("%clang_args", clang_arguments % (config.cuda_sdk_root, config.cuda_dnn_root)))
 config.substitutions.append(("%hipify_args", hipify_arguments % (config.cuda_root)))