[llvm] [offload] Add `std::ostream` version of OffloadPrint.hpp (PR #222269)

[Jan Trusiłło via llvm-commits]

311Volt wrote:

I take that back, that would break `OFFLOAD_TRACE` as the generated tablegen wrappers all write to `llvm::errs()`. Leaving the PR as is for now.

https://github.com/llvm/llvm-project/pull/222269