[NFC] add a pre-commit test case for patch 122741 (#135247) [NFC] add a pre-commit test case for patch [Eliminating li of 0 into arg registers of unused arguments](https://github.com/llvm/llvm-project/pull/122741) The test case tests that extend poison are lower to undef and also test there are redendunt instrution load 0 into argument registers for unused arguments.
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