Revert r240137 (Fixed/added namespace ending comments using clang-tidy. NFC)

Apparently, the style needs to be agreed upon first.

llvm-svn: 240390
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 7c4b970..fc476e0 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -307,7 +307,7 @@
            "Unknown sched type!");
     return createILPListDAGScheduler(IS, OptLevel);
   }
-} // namespace llvm
+}
 
 // EmitInstrWithCustomInserter - This method should be implemented by targets
 // that mark instructions with the 'usesCustomInserter' flag.  These
@@ -2542,7 +2542,7 @@
           J.setNode(E);
   }
 };
-} // namespace
+}
 
 SDNode *SelectionDAGISel::
 SelectCodeCommon(SDNode *NodeToMatch, const unsigned char *MatcherTable,