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

llvm-svn: 9903
diff --git a/llvm/include/Support/EquivalenceClasses.h b/llvm/include/Support/EquivalenceClasses.h
index 01e8c5e..46e626b 100644
--- a/llvm/include/Support/EquivalenceClasses.h
+++ b/llvm/include/Support/EquivalenceClasses.h
@@ -20,6 +20,8 @@
 #include <map>
 #include <vector>
 
+namespace llvm {
+
 template <class ElemTy>
 class EquivalenceClasses {
   // Maps each element to the element that is the leader of its 
@@ -89,4 +91,6 @@
   }
 };
 
+} // End llvm namespace
+
 #endif