[llvm] [Analysis] Guard logf128 cst folding (PR #106543)

[Thomas Preud'homme via llvm-commits]

RoboTux wrote:

I've reverted it because some tests were failing. I guess that makes sense because since LLVM_HAS_LOGF128 is OFF by default hence the test would be failing. It'll need a REQUIRE.

https://github.com/llvm/llvm-project/pull/106543