[deploy]禁用后端SimpleRegAlloc

src/backend/RISCv64/RISCv64Backend.cpp

@@ -268,7 +268,6 @@ std::string RISCv64CodeGen::function_gen(Function* func) {
 
     // 阶段 3: 物理寄存器分配 (Register Allocation)
     bool allocation_succeeded = false;
-
     // 尝试迭代图着色 (IRC)
     if (!irc_failed) {
         if (DEBUG) std::cerr << "Attempting Register Allocation with Iterated Register Coloring (IRC)...\n";        
@@ -308,6 +307,9 @@ std::string RISCv64CodeGen::function_gen(Function* func) {
     
     // 尝试简单图着色 (SGC) 
     if (!allocation_succeeded) {
+        if (optLevel > 0) {
+            exit(-1);
+        }
         // 如果是从IRC失败回退过来的，需要重新创建干净的mfunc和ISel
         RISCv64ISel isel_for_sgc;
         if (irc_failed) {