CodeGen: Remove implicit ilist iterator conversions, NFC

Make ilist iterator conversions explicit in clangCodeGen.  Eventually
I'll remove them everywhere.

llvm-svn: 252358

clang/lib/CodeGen/CodeGenModule.cpp

@@ -235,7 +235,8 @@ void CodeGenModule::applyReplacements() {
     OldF->replaceAllUsesWith(Replacement);
     if (NewF) {
       NewF->removeFromParent();
-      OldF->getParent()->getFunctionList().insertAfter(OldF, NewF);
+      OldF->getParent()->getFunctionList().insertAfter(OldF->getIterator(),
+                                                       NewF);
     }
     OldF->eraseFromParent();
   }