Move the Attributes::Builder outside of the Attributes class and into its own class named AttrBuilder. No functionality change.

llvm-svn: 165960
diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
index d4eeafa..6468ff3 100644
--- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
@@ -2062,7 +2062,7 @@
 }
 
 static AttrListPtr StripNest(LLVMContext &C, const AttrListPtr &Attrs) {
-  Attributes::Builder B;
+  AttrBuilder B;
   B.addAttribute(Attributes::Nest);
 
   for (unsigned i = 0, e = Attrs.getNumSlots(); i != e; ++i) {