[flang] [llvm] [Flang] [OpenMP] Add semantic checks for detach clause in task (PR #119172)

[Thirumalai Shaktivel via llvm-commits]

Thirumalai-Shaktivel wrote:

Thanks for the reviews, @kparzysz and @tblah.

@tblah, can you please do a final review on this PR? I have addressed your comments. If I missed anything, please let me know.

https://github.com/llvm/llvm-project/pull/119172