[llvm] [VectorUtils] Trivially vectorize ldexp, [l]lround (PR #145545)

[David Green via llvm-commits]

davemgreen wrote:

Does this fail for you? https://godbolt.org/z/17Ye168cK
The original is something like `flang llvm-test-suite/Fortran/gfortran/regression/vect/pr106253.f -O3 -march=armv9-a`

https://github.com/llvm/llvm-project/pull/145545