[midend]修复entryBB和funcBodyEntry的初始化，Dom计算引进逆后续遍历和LT算法，Pass先默认关掉CFGOpt

src/midend/SysYIRGenerator.cpp

@@ -1037,6 +1037,7 @@ std::any SysYIRGenerator::visitFuncDef(SysYParser::FuncDefContext *ctx){
   
   // 从 entryBB 无条件跳转到 funcBodyEntry
   builder.createUncondBrInst(funcBodyEntry);
+  BasicBlock::conectBlocks(entry, funcBodyEntry); // 连接 entryBB 和 funcBodyEntry
   builder.setPosition(funcBodyEntry,funcBodyEntry->end()); // 将插入点设置到 funcBodyEntry
 
   for (auto item : ctx->blockStmt()->blockItem()) {