[AIMIGRAPHX-885] Add hip graph to MIGraphX EP#234

Draft

TedThemistokleous wants to merge 15 commits intorocm7.2_internal_testingfrom

Commits on May 6, 2026

Add pinned GPU memory allocation on startup. Saves alloc/dealloc overhead by statically allocating buffers for model IO/params on session start
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Cleanup part of code for pinned alloc
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Ensure no race condition and contention with pinned_io allocation on session startup or defered compile
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Add hip_graph_enable flag to MIGraphX EP provider options
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Filter hipGraph capture based on MIGraphX ENV variables
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Add hipGraph Capture/replay to MIGraphXFuncState
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Add INFO-level debug logging to MIGraphX EP compile and compute pipeline
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fixes for hipgraph capture/replay WIP
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remove debug logging
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Add size-bucketed pool allocator for hipGraph pointer stability
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Add direct-bind hipGraph capture/replay path
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Route ultra-fast/fast/standard paths through direct-bind hipGraph
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Add pointer-drift detection with re-capture limit and fallback
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Ensure padding path falls back to pinned-copy hipGraph correctly
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update warmup iterations
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