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/CodeGen/CoreCLRGC.cpp b/llvm/lib/CodeGen/CoreCLRGC.cpp
index 0816d14..28c97ba 100644
--- a/llvm/lib/CodeGen/CoreCLRGC.cpp
+++ b/llvm/lib/CodeGen/CoreCLRGC.cpp
@@ -45,7 +45,7 @@
     return (1 == PT->getAddressSpace());
   }
 };
-} // namespace
+}
 
 static GCRegistry::Add<CoreCLRGC> X("coreclr", "CoreCLR-compatible GC");