[clang] [NFC][clang-repl] Introduce OffloadType for CUDA/HIP device selection (PR #231391)

[Vassil Vassilev via cfe-commits]

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@@ -46,6 +46,8 @@ class Decl;
 class IncrementalParser;
 class IncrementalDeviceParser;
 
+enum class OffloadType { CUDA, HIP };
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vgvassilev wrote:

```suggestion
enum class OffloadType { Detect, CUDA, HIP };
```

Most of the time it is a single vendor device -- that would be convenient for users if we can implement it reliably.

https://github.com/llvm/llvm-project/pull/231391