[llvm] [SelectionDAG] optimize sdiv with positive divisor and positive magic (PR #189287)

[Craig Topper via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 6
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topperc wrote:

Why do we need new test files? Surely there are existing files we can add this to.

https://github.com/llvm/llvm-project/pull/189287