Several test cases where `async` is followed by synchronous execution without intervening `wait` about openaccv-v

[ajarmusch]

Thank you for bringing this issue to my attention. Based on your description, it seems that the current code may lead to incorrect behavior if the exit data starts executing while the preceding async(1) code is still in progress. This could result in data being unmapped prematurely while it's still in use. We will fix this test and start looking into other async tests that need addressing.

When a PR is being made I will link this issue and close it at the time of the merge. Thank you.

[tschwinge]

If we think that'd be useful, I could also bring this up with the OpenACC Technical Committee for clarification?

[ajarmusch]

Thank you! Were you able to bring this up with he Committee? We want to make sure our implementation is correct. If you get the chance please take a look at the related PR. Thank you for your patience!!