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/Support/Unix/ThreadLocal.inc b/llvm/lib/Support/Unix/ThreadLocal.inc
index a04dd3e..31c3f38 100644
--- a/llvm/lib/Support/Unix/ThreadLocal.inc
+++ b/llvm/lib/Support/Unix/ThreadLocal.inc
@@ -56,7 +56,7 @@
   setInstance(nullptr);
 }
 
-} // namespace llvm
+}
 #else
 namespace llvm {
 using namespace sys;