More encapsulation work.

Use the AttributeSet when we're talking about more than one attribute. Add a
function that adds a single attribute. No functionality change intended.

llvm-svn: 173196
diff --git a/llvm/lib/Transforms/IPO/PruneEH.cpp b/llvm/lib/Transforms/IPO/PruneEH.cpp
index d872f0c..98c2602 100644
--- a/llvm/lib/Transforms/IPO/PruneEH.cpp
+++ b/llvm/lib/Transforms/IPO/PruneEH.cpp
@@ -146,9 +146,11 @@
 
       Function *F = (*I)->getFunction();
       const AttributeSet &PAL = F->getAttributes();
-      const AttributeSet &NPAL = PAL.addAttr(F->getContext(), ~0,
-                                            Attribute::get(F->getContext(),
-                                                            NewAttributes));
+      const AttributeSet &NPAL =
+        PAL.addFnAttributes(F->getContext(),
+                            AttributeSet::get(F->getContext(),
+                                              AttributeSet::FunctionIndex,
+                                              NewAttributes));
       if (PAL != NPAL) {
         MadeChange = true;
         F->setAttributes(NPAL);