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/ARMSubtarget.h b/llvm/lib/Target/ARM/ARMSubtarget.h
index f00594f..9909a6a 100644
--- a/llvm/lib/Target/ARM/ARMSubtarget.h
+++ b/llvm/lib/Target/ARM/ARMSubtarget.h
@@ -453,6 +453,6 @@
   /// True if fast-isel is used.
   bool useFastISel() const;
 };
-} // namespace llvm
+} // End llvm namespace
 
 #endif  // ARMSUBTARGET_H