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/Transforms/IPO/LoopExtractor.cpp b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
index ada4a76..41334ca 100644
--- a/llvm/lib/Transforms/IPO/LoopExtractor.cpp
+++ b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
@@ -51,7 +51,7 @@
       AU.addRequired<DominatorTreeWrapperPass>();
     }
   };
-} // namespace
+}
 
 char LoopExtractor::ID = 0;
 INITIALIZE_PASS_BEGIN(LoopExtractor, "loop-extract",
@@ -183,7 +183,7 @@
 
     bool runOnModule(Module &M) override;
   };
-} // namespace
+}
 
 char BlockExtractorPass::ID = 0;
 INITIALIZE_PASS(BlockExtractorPass, "extract-blocks",