Put all LLVM code into the llvm namespace, as per bug 109.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@9903 91177308-0d34-0410-b5e6-96231b3b80d8

include/Support/PostOrderIterator.h

@@ -21,6 +21,8 @@
 #include <stack>
 #include <set>
 
+namespace llvm {
+
 template<class GraphT, class GT = GraphTraits<GraphT> >
 class po_iterator : public forward_iterator<typename GT::NodeType, ptrdiff_t> {
   typedef forward_iterator<typename GT::NodeType, ptrdiff_t> super;
@@ -149,4 +151,6 @@ public:
   inline rpo_iterator end()   { return Blocks.rend(); }
 };
 
+} // End llvm namespace
+
 #endif