Change the letters used to represent stack and heap allocations to "S" and "H"
respectively.  This is to make presentation easier in the paper.

llvm-svn: 4514
diff --git a/llvm/lib/Analysis/DataStructure/Printer.cpp b/llvm/lib/Analysis/DataStructure/Printer.cpp
index 26424be..a58f7ef 100644
--- a/llvm/lib/Analysis/DataStructure/Printer.cpp
+++ b/llvm/lib/Analysis/DataStructure/Printer.cpp
@@ -36,8 +36,8 @@
     OS << "\n";
   }
 
-  if (N->NodeType & DSNode::AllocaNode ) OS << "A";
-  if (N->NodeType & DSNode::NewNode    ) OS << "N";
+  if (N->NodeType & DSNode::AllocaNode ) OS << "S";
+  if (N->NodeType & DSNode::NewNode    ) OS << "H";
   if (N->NodeType & DSNode::GlobalNode ) OS << "G";
   if (N->NodeType & DSNode::UnknownNode) OS << "U";
   if (N->NodeType & DSNode::Incomplete ) OS << "I";