[Offload] Remove non-blocking allocation type (#159851) Summary: This was originally added in as a hack to work around CUDA's limitation on allocation. The `libc` implementation now isn't even used for CUDA so this code is never hit. Even if this case, this code never truly worked. A true solution would be to use CUDA's virtual memory API instead to allocate 2MiB slabs independenctly from the normal memory management done in the stream.
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