stop using arg_back


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@20598 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/CBackend/CBackend.cpp b/lib/Target/CBackend/CBackend.cpp
index d010509..254b5a4 100644
--- a/lib/Target/CBackend/CBackend.cpp
+++ b/lib/Target/CBackend/CBackend.cpp
@@ -1472,7 +1472,7 @@
                     << I.getParent()->getParent()->getName() << "'!\n";
           abort();
         }
-        writeOperand(&I.getParent()->getParent()->arg_back());
+        writeOperand(--I.getParent()->getParent()->arg_end());
         Out << ')';
         return;
       case Intrinsic::vaend:
diff --git a/lib/Target/CBackend/Writer.cpp b/lib/Target/CBackend/Writer.cpp
index d010509..254b5a4 100644
--- a/lib/Target/CBackend/Writer.cpp
+++ b/lib/Target/CBackend/Writer.cpp
@@ -1472,7 +1472,7 @@
                     << I.getParent()->getParent()->getName() << "'!\n";
           abort();
         }
-        writeOperand(&I.getParent()->getParent()->arg_back());
+        writeOperand(--I.getParent()->getParent()->arg_end());
         Out << ')';
         return;
       case Intrinsic::vaend: