[llvm] Constant Fold Logf128 calls (PR #84501)

[Nick Desaulniers via llvm-commits]

nickdesaulniers wrote:

@efriedma-quic could we do something like this to solve https://github.com/llvm/llvm-project/issues/90685#issuecomment-2125416687 (if the target matched the host)?

https://github.com/llvm/llvm-project/pull/84501