[llvm] [Support] add move operations to raw_ostream (PR #85134)

[Sabianin Maksim via llvm-commits]

s-mx wrote:

My initial desire was to add move operations to `raw_fd_ostream`. However, I've just realised that my patch is insufficient for that and I need to do it more careful and `raw_fd_ostream` should have a concrete implementation instead of default one.

https://github.com/llvm/llvm-project/pull/85134