[llvm] [DebugInfo][LoopVectorizer][NFC] Use unknown annotations for more instructions (PR #170522)

[Ramkumar Ramachandra via llvm-commits]

https://github.com/artagnon commented:

Out of curiosity, when are we supposed to use DebugLoc::getCompilerGenerated()?

https://github.com/llvm/llvm-project/pull/170522