[SystemZ] Update namespace formatting to match current guidelines

No functional change intended.

llvm-svn: 203103
diff --git a/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h b/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h
index d8e5806..1a9aad9 100644
--- a/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h
+++ b/llvm/lib/Target/SystemZ/SystemZSelectionDAGInfo.h
@@ -74,6 +74,6 @@
                            MachinePointerInfo SrcPtrInfo) const override;
 };
 
-}
+} // end namespace llvm
 
 #endif