GraphiteDawn: Use std::memory_or_acquire for last load in DawnAsyncWait

Bug: dawn:2045
Change-Id: I6c773f7216b24d30073105de08f3e08ed5d84a99
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/759876
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Quyen Le <lehoangquyen@chromium.org>
1 file changed