[flang][cuda][rt] Track asynchronous allocation stream for deallocation (#137073) When an asynchronous allocation is made, we call `cudaMallocAsync` with a stream. For deallocation, we need to call `cudaFreeAsync` with the same stream. in order to achieve that, we need to track the allocation and their respective stream. This patch adds a simple sorted array of asynchronous allocations. A binary search is performed to retrieve the allocation when deallocation is needed.
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