[llvm] [RFC][SelectionDAG] Not issue TRAP node if naked function (PR #132147)

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yonghong-song wrote:

> This code also exists in GlobalISel (IRTranslator::translateUnreachable). I think we have reached the point where we should extract these 3 implementations of the same checks into a helper, to make sure it stays consistent.

Good point. I missed GlobalISel. I will try to have a common helper for all these three cases.

https://github.com/llvm/llvm-project/pull/132147