Fix synchronization before testing cublasXt calls. #577
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Fixes #124, fixes #536
cc @kshyatt this was a fun one; cuBLASXt doesn't respect stream semantics, so we need to make sure data is actually ready before calling the API. Similarly, the API is actually blocking, so we don't need to sync afterwards. I wonder if something similar is happening with some of the sporadic failures in the -MG PRs.