[clang] [OpenMP-5.2] deprecate delimited form of 'declare target' (PR #145854)

[Urvi Rav via cfe-commits]

ravurvi20 wrote:

@alexey-bataev I have updated Release notes. Since it's just a deprecation it is not there in support file.


https://github.com/llvm/llvm-project/pull/145854