[llvm] [libsycl] Move and rename the shared library (PR #188770)

[Sergey Semenov via llvm-commits]

sergey-semenov wrote:

Yeah, it seems to be inconsistent across the runtimes. I think handling it the same way in build and install makes more sense, so I don't mind reverting the "build" part of the change.

https://github.com/llvm/llvm-project/pull/188770