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

llvm-svn: 9903
diff --git a/llvm/lib/Analysis/DataStructure/GraphChecker.cpp b/llvm/lib/Analysis/DataStructure/GraphChecker.cpp
index b0164da..11ebc69 100644
--- a/llvm/lib/Analysis/DataStructure/GraphChecker.cpp
+++ b/llvm/lib/Analysis/DataStructure/GraphChecker.cpp
@@ -29,6 +29,8 @@
 #include "llvm/Value.h"
 #include <set>
 
+namespace llvm {
+
 namespace {
   enum DSPass { local, bu, td };
   cl::opt<DSPass>
@@ -193,3 +195,5 @@
       }
   }
 }
+
+} // End llvm namespace