Add an enum for the return and function indexes into the AttrListPtr object. This gets rid of some magic numbers.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@165924 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Transforms/Utils/CloneFunction.cpp b/lib/Transforms/Utils/CloneFunction.cpp
index 831f94a..7ba9f6d 100644
--- a/lib/Transforms/Utils/CloneFunction.cpp
+++ b/lib/Transforms/Utils/CloneFunction.cpp
@@ -98,11 +98,13 @@
         Anew->addAttr( OldFunc->getAttributes()
                        .getParamAttributes(I->getArgNo() + 1));
     NewFunc->setAttributes(NewFunc->getAttributes()
-                           .addAttr(NewFunc->getContext(), 0,
+                           .addAttr(NewFunc->getContext(),
+                                    AttrListPtr::ReturnIndex,
                                     OldFunc->getAttributes()
                                      .getRetAttributes()));
     NewFunc->setAttributes(NewFunc->getAttributes()
-                           .addAttr(NewFunc->getContext(), ~0,
+                           .addAttr(NewFunc->getContext(),
+                                    AttrListPtr::FunctionIndex,
                                     OldFunc->getAttributes()
                                      .getFnAttributes()));