[llvm] [libsycl] Add constructors for context (PR #214538)

[Kseniya Tikhomirova via llvm-commits]

KseniyaTikhomirova wrote:

I made a resolution on GH web version, will see if it works. no actions from @Robertkq is required now.

https://github.com/llvm/llvm-project/pull/214538