[clang] [llvm] [BPF] Lower unwinding to unwind_goto and unwind_exit (PR #233649)

[Kazu Hirata via cfe-commits]

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kazutakahirata wrote:

Nit: May I suggest removing `#include "llvm/IR/DiagnosticInfo.h"` now that `BPFAsmPrinter::emitFunctionBodyEnd`, which was the only user of `DiagnosticInfoUnsupported` in this file, has been removed?

```suggestion
```

https://github.com/llvm/llvm-project/pull/233649