debug(phase2): 插桩 llc worker 打印 system 返回码，定位 ClassArrayTest 固定 llc 失败误报

App/lib/core/BuildPipeline.vp

@@ -512,11 +512,25 @@ def _llc_task_worker(arg: t.CPtr) -> t.CPtr:
     task: LlcTask | t.CPtr = (LlcTask | t.CPtr)(arg)
     if task is None:
         return t.CPtr(0)
+    #region debug-point LLC0
+    stdio.printf("[LLC-DBG] worker 开始 sha1=%s cmd=%s\n",
+                 (task.ModuleSha1 if task.ModuleSha1 is not None else "?"),
+                 (task.LlcCmd if task.LlcCmd is not None else "?"))
+    #endregion
     if task.OptCmd is not None:
-        if stdlib.system(task.OptCmd) != 0:
+        opt_rc: int = stdlib.system(task.OptCmd)
+        #region debug-point LLC1
+        stdio.printf("[LLC-DBG] opt rc=%d\n", opt_rc)
+        #endregion
+        if opt_rc != 0:
             task.Result = 1
             return t.CPtr(0)
-    if stdlib.system(task.LlcCmd) != 0:
+    llc_rc: int = stdlib.system(task.LlcCmd)
+    #region debug-point LLC2
+    stdio.printf("[LLC-DBG] llc rc=%d sha1=%s\n", llc_rc,
+                 (task.ModuleSha1 if task.ModuleSha1 is not None else "?"))
+    #endregion
+    if llc_rc != 0:
         task.Result = 1
     else:
         task.Result = 0
@@ -569,6 +583,10 @@ def run_llc_parallel(tasks: bytes, task_count: int, max_threads: int) -> int:
             tsk2: LlcTask | t.CPtr = (LlcTask | t.CPtr)(t.CVoid(
                 t.CUInt64T(tasks) + t.CSizeT(batch_start + j) * slot_size, t.CPtr))
             if tsk2 is not None and tsk2.Result != 0:
+                #region debug-point LLC3
+                stdio.printf("[LLC-DBG] 失败槽 Result=%d sha1=%s\n", tsk2.Result,
+                             (tsk2.ModuleSha1 if tsk2.ModuleSha1 is not None else "?"))
+                #endregion
                 fb: str = VLogger.fmt_buf()
                 if fb is not None:
                     viperlib.snprintf(fb, 1024, "llc 编译失败: %s (cmd=%s)",