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/ProfileData/InstrProf.cpp b/llvm/lib/ProfileData/InstrProf.cpp
index 805d6d1..92822a7 100644
--- a/llvm/lib/ProfileData/InstrProf.cpp
+++ b/llvm/lib/ProfileData/InstrProf.cpp
@@ -54,7 +54,7 @@
     llvm_unreachable("A value of instrprof_error has no message.");
   }
 };
-} // namespace
+}
 
 static ManagedStatic<InstrProfErrorCategoryType> ErrorCategory;