[llvm] [CodeGen] Regen some old tests; NFC (PR #91250)

[Heejin Ahn via llvm-commits]

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@@ -1,3 +1,4 @@
+; NOTE: Assertions have been autogenerated by utils/update_llc_test_checks.py UTC_ARGS: --version 4
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aheejin wrote:

Assertions in this test and the below (`simd-sext-inreg.ll`) are not autogenerated. Why are these said to be autogenerated?

https://github.com/llvm/llvm-project/pull/91250