[llvm] [AArch64] Cap upper-bound unrolling of loops with uncomputable trip counts (PR #205102)

[Florian Hahn via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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fhahn wrote:

please generate with latest version of UTC (`--version 6`)

https://github.com/llvm/llvm-project/pull/205102