refactor(dev): unify user-facing diagnostics

src/mir/FrameLowering.cpp

@@ -3,6 +3,8 @@
 #include <stdexcept>
 #include <vector>
 
+#include "utils/Log.h"
+
 namespace mir {
 namespace {
 
@@ -17,8 +19,7 @@ void RunFrameLowering(MachineFunction& function) {
   for (const auto& slot : function.frame_slots()) {
     cursor += slot.size;
     if (-cursor < -256) {
-      throw std::runtime_error(
-          "Lab3 MVP 后端暂不支持超过 64 个 i32 栈槽的函数");
+      throw std::runtime_error(FormatError("mir", "暂不支持过大的栈帧"));
     }
   }