[flang-commits] [flang] [acc] `acc declare` + `present` clause for COMMON blocks (PR #175588)

[Razvan Lupusoru via flang-commits]

https://github.com/razvanlupusoru approved this pull request.

Looks good other than the request to make sure to use lines from OpenACC 3.4 spec. 

Otherwise, I want to point out that we may have to revisit making a common block available for device for a scoping period longer than the subroutine's scope since it is not clear to me this is quite right. However, I am OK for now due to seeing this pattern in codes that have this expectation.

https://github.com/llvm/llvm-project/pull/175588