[NFC] Remove dead code in ExtAddrMode::print checked by coverty tool

Author: xiangzh1

llvm/lib/CodeGen/CodeGenPrepare.cpp

@@ -2687,7 +2687,7 @@ void ExtAddrMode::print(raw_ostream &OS) const {
   if (InBounds)
     OS << "inbounds ";
   if (BaseGV) {
-    OS << (NeedPlus ? " + " : "") << "GV:";
+    OS << "GV:";
     BaseGV->printAsOperand(OS, /*PrintType=*/false);
     NeedPlus = true;
   }