[llvm] [InstCombine] Fix for folding `select` into floating point binary operators. (PR #83200)

[via llvm-commits]

alexfh wrote:

We've noticed a 10-20% regression of the https://github.com/llvm/llvm-test-suite/tree/main/MultiSource/Benchmarks/Ptrdist/ks benchmark on AArch64 after this commit. We don't consider this an important microbenchmark, but I wanted to let you know just in case.

https://github.com/llvm/llvm-project/pull/83200