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

Apparently, the style needs to be agreed upon first.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240390 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Support/Valgrind.h

@@ -67,7 +67,7 @@ namespace sys {
   #define TsanIgnoreWritesBegin()
   #define TsanIgnoreWritesEnd()
 #endif
-} // namespace sys
-} // namespace llvm
+}
+}
 
 #endif