Fix cpplint whitespace/comments issues

Change-Id: Iae286862c85fb8fd8901eae1204cd6d271d69496
diff --git a/compiler/llvm/ir_builder.cc b/compiler/llvm/ir_builder.cc
index a65cf2b..9644ebd 100644
--- a/compiler/llvm/ir_builder.cc
+++ b/compiler/llvm/ir_builder.cc
@@ -126,5 +126,5 @@
 }
 
 
-} // namespace llvm
-} // namespace art
+}  // namespace llvm
+}  // namespace art