[llvm] [SDAG] Honor signed arguments in floating point libcalls (PR #109134)

[Nikita Popov via llvm-commits]

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nikic wrote:

You `llvm/utils/update_llc_test_checks.py` to generate the check lines.

Also this test should go into llvm/test/CodeGen/PowerPC and then drop the REQUIRES.

https://github.com/llvm/llvm-project/pull/109134