Add standalone C++/HIP examples investigating hipMemAllocationTypeUncached for P2P atomics#419

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copilot/fix-vmem-allocator-atomics

Commits on Mar 4, 2026

Initial plan
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Fix VMemAllocator P2P atomics: replace hipMemCreate (coarse-grained) with malloc_fine_grained

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Address code review: use Any type annotation, rename peer_heap to peer_heap_base

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Add HSA VMem Path 3: APIs, minimal P2P repro, and HsaVMemAllocator

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Confirm HSA VMem P2P atomic correctness vs HIP VMem bug at repro level

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Try hipMemAllocationTypeUncached: add constant, alloc_type param, and probe test

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Add standalone C++/HIP examples: P2P VMem atomics (HSA fine-grained vs HIP coarse-grained)

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