[midend]修复phi指令接口，优化遍适配

src/midend/SysYIRPrinter.cpp

@@ -512,9 +512,9 @@ void SysYPrinter::printInst(Instruction *pInst) {
         if (!firstPair) std::cout << ", ";
         firstPair = false;
         std::cout << "[ ";
-        printValue(phiInst->getValue(i));
+        printValue(phiInst->getIncomingValue(i));
         std::cout << ", %";
-        printBlock(phiInst->getBlock(i));
+        printBlock(phiInst->getIncomingBlock(i));
         std::cout << " ]";
       }
       std::cout << std::endl;