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/Target/ARM/ARMInstrInfo.cpp b/llvm/lib/Target/ARM/ARMInstrInfo.cpp
index 59e1535..84f95be 100644
--- a/llvm/lib/Target/ARM/ARMInstrInfo.cpp
+++ b/llvm/lib/Target/ARM/ARMInstrInfo.cpp
@@ -198,7 +198,7 @@
       MachineFunctionPass::getAnalysisUsage(AU);
     }
   };
-} // namespace
+}
 
 char ARMCGBR::ID = 0;
 FunctionPass*