Import pta_oom_2.9.1 HCCL OOM fault injection from gitcode

[yjyang62]

Summary

This branch copies the pta_oom_2.9.1 branch from https://gitcode.com/yangjinyang/pytorch into this repository.

Changes

• ProcessGroupHCCL.cpp: Add configurable HCCL OOM fault injection via maybeThrowHcclOom() after collective/P2P HCCL calls. Trigger count is controlled by the HCCL_OOM_TRIGGER_COUNT environment variable (default: 6000).
• NPUCachingAllocator.cpp: Remove the fixed-counter PTA malloc OOM injection (g_malloc_call_count at 60004).
• HCCLUtils.hpp: Keep the original HCCL_CHECK_ERROR macro without macro-level OOM injection.

Usage

export HCCL_OOM_TRIGGER_COUNT=6000   # inject OOM after the 6001st HCCL op
# export HCCL_OOM_TRIGGER_COUNT=0     # disable injection

Source

• Remote: https://gitcode.com/yangjinyang/pytorch
• Branch: pta_oom_2.9.1
• Tip commit: d8450a496 (hccloom)

Test plan

• Set HCCL_OOM_TRIGGER_COUNT and verify HCCL OOM is injected at the expected collective count
• Verify fast recovery (stop_device → restart_device → reinit_process_group) works after injected OOM
• Confirm HCCL_OOM_TRIGGER_COUNT=0 disables injection