Please don't use undef in tests (part 2)

LLVM Project
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Please send PRs with false positives my way. I’m happy to fix them.
The warnings has been successful so far in reducing new uses of undef, so I really think we should keep it. It’s just a matter of of refining it where needed. I can do that.

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I’ve just about removed all the undef uses in amdgpu tests, and I triggered the warning on just about all of them. AMDGPU: Migrate some tests away from undef by arsenm · Pull Request #131277 · llvm/llvm-project · GitHub is one sample

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Thanks; I’ll fix that.
(but give me a week; I’ve a deadline next week..)