[flang] Allow to pass an async id to allocate the descriptor (#118713) This is a patch in preparation for the support stream ordered memory allocator in CUDA Fortran. This patch adds an asynchronous id to the AllocatableAllocate runtime function and to Descriptor::Allocate so it can be passed down to the registered allocator. It is up to the allocator to use this value or not. A follow up patch will implement that asynchronous allocator for CUDA Fortran.
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