[llvm] [SYCL] Add property set types and JSON representation (PR #147321)

[Arvind Sudarsanam via llvm-commits]

asudarsa wrote:

> TEST 'lld :: COFF/import_weak_alias.test' failure seems unrelated. Looking at it a bit closer.
> 
> Thanks

Seems like this test was failing in few of the earlier PRs..

https://github.com/llvm/llvm-project/pull/147321