Use enum values instead of magic numbers for indexing into the attribute list.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@165925 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/CGCall.cpp b/lib/CodeGen/CGCall.cpp
index 15db9fd..715438c 100644
--- a/lib/CodeGen/CGCall.cpp
+++ b/lib/CodeGen/CGCall.cpp
@@ -1006,7 +1006,7 @@
 
   if (RetAttrs.hasAttributes())
     PAL.push_back(llvm::
-                  AttributeWithIndex::get(0,
+                  AttributeWithIndex::get(llvm::AttrListPtr::ReturnIndex,
                                          llvm::Attributes::get(getLLVMContext(),
                                                                RetAttrs)));
 
@@ -1080,7 +1080,8 @@
     ++Index;
   }
   if (FuncAttrs.hasAttributes())
-    PAL.push_back(llvm::AttributeWithIndex::get(~0,
+    PAL.push_back(llvm::
+                  AttributeWithIndex::get(llvm::AttrListPtr::FunctionIndex,
                                          llvm::Attributes::get(getLLVMContext(),
                                                                FuncAttrs)));
 }