[llvm] [LoopUnroll] Cap unrolling and peeling in very large loop nests (PR #221702)

[Florian Hahn via llvm-commits]

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fhahn wrote:

nit: this can probably be made a bit more compact as well.
```suggestion
             "outermost nest contains more than this many loops (0 = no "
```

https://github.com/llvm/llvm-project/pull/221702