Regularize the names of #include-guards.

llvm-svn: 6732
diff --git a/llvm/include/Support/GraphTraits.h b/llvm/include/Support/GraphTraits.h
index 754e38f..15c285d 100644
--- a/llvm/include/Support/GraphTraits.h
+++ b/llvm/include/Support/GraphTraits.h
@@ -8,8 +8,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_SUPPORT_GRAPH_TRAITS_H
-#define LLVM_SUPPORT_GRAPH_TRAITS_H
+#ifndef SUPPORT_GRAPHTRAITS_H
+#define SUPPORT_GRAPHTRAITS_H
 
 // GraphTraits - This class should be specialized by different graph types...
 // which is why the default version is empty.