[llvm] [Offload] Use new error code handling mechanism (PR #139275)

[Shilei Tian via llvm-commits]

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+//===- Auto-generated file, part of the LLVM/Offload project --------------===//
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shiltian wrote:

I think @arsenm 's point is, why not just generate it on the fly during building, like other tablegen files in LLVM.

https://github.com/llvm/llvm-project/pull/139275