支持环境变量指定 MACA 架构#29
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该 PR 支持通过环境变量指定 MACA 目标架构，使同一套源码更容易在不同沐曦设备和测试镜像间切换。
这个修改面向沐曦 GPU 适配场景中比较容易影响开发、构建或验证稳定性的环节，把原来需要人工排查的问题前移到工具链、运行前检查或基准脚本中处理。实现上保持对现有默认行为的兼容，只在检测到明确配置、输入或环境异常时给出更直接的诊断，避免引入额外运行依赖，也方便维护者独立审阅该分支。
已在沐曦算力环境中完成对应分支验证，验证记录包含真实运行日志、命令输出和失败路径检查，本地归档目录为：E:/Documents/muxi/测试报告/mcTVM_new_toolchain_validation_20260608。提交分支：
mengz/use-env-maca-arch，目标仓库：MetaX-MACA/mcTVM。