[llvm] [SYCL][LLVM] Adding property set I/O library for SYCL (PR #110771)

[Arvind Sudarsanam via llvm-commits]

asudarsa wrote:

Hi @arsenm, @jhuber6 and @tahonermann 

Thanks so much for the feedback.
I have added three separate commits to address the concerns here.
Commit 1:
Remove changes to Base64 implementation and use existing implementation
Commit 2:
Add SYCL prefix to PropertySet etc.
Commit 3:
Add tests expected to fail and make sure errors are caught

Please take a look when convenient.

Thanks again
Sincerely

https://github.com/llvm/llvm-project/pull/110771