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

llvm-svn: 9903
diff --git a/llvm/lib/CodeGen/InstrSched/SchedGraph.h b/llvm/lib/CodeGen/InstrSched/SchedGraph.h
index 50cc052..5aee9b2 100644
--- a/llvm/lib/CodeGen/InstrSched/SchedGraph.h
+++ b/llvm/lib/CodeGen/InstrSched/SchedGraph.h
@@ -25,6 +25,8 @@
 #include "Support/hash_map"
 #include "Support/GraphTraits.h"
 
+namespace llvm {
+
 class RegToRefVecMap;
 class ValueToDefVecMap;
 class RefVec;
@@ -317,4 +319,6 @@
   }
 };
 
+} // End llvm namespace
+
 #endif