[clang] [OpenACC] Implement 'return' branch-out of Compute Construct (PR #82814)

[Erich Keane via cfe-commits]

erichkeane wrote:

> Looks good. Looks like something similar should be done for goto

Thanks!  Yes, I agree we probably want to do something similar for goto, but I'm still looking at it.  Trying to keep patches small :) 

https://github.com/llvm/llvm-project/pull/82814