[llvm] [DebugInfo] Fix an assertion in DWARFTypePrinter (PR #178986)

[Peter Rong via llvm-commits]

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DataCorrupted wrote:

Another PR would be an overkill. I re-organized the commits such that the commit 1 updates the tests, commit 2 fixes the bug, and commit 3 update the tests again, such that you can review [commit 3](https://github.com/llvm/llvm-project/pull/178986/changes/c46b3ff93827c434ac3a12aa8f1e02aff471d155) to validate the changes we made. 

https://github.com/llvm/llvm-project/pull/178986