[ROCm] Check native BF16 support for AMP#51
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PR Category
Environment Adaptation
PR Types
Improvements
Description
当前 AMP 的 BF16 可用性判断在 ROCm 构建下直接返回 True，可能导致不具备 native BF16 的 AMD GPU 进入 BF16 autocast 路径。
本 PR 将 BF16 capability 判断下沉到 C++/PHI GPU info：CUDA 保留 compute capability 与 runtime 版本判断；ROCm 基于 gcnArchName 仅对 gfx90a、gfx94*、gfx95* 返回支持。Python autocast 统一调用 core.is_bfloat16_supported，并补充单测覆盖 ROCm 分支。
是否引起精度变化
否