Fixed/added namespace ending comments using clang-tidy. NFC

The patch is generated using this command:

tools/clang/tools/extra/clang-tidy/tool/run-clang-tidy.py -fix \
  -checks=-*,llvm-namespace-comment -header-filter='llvm/.*|clang/.*' \
  llvm/lib/


Thanks to Eugene Kosov for the original patch!

llvm-svn: 240137
diff --git a/llvm/lib/Support/ARMWinEH.cpp b/llvm/lib/Support/ARMWinEH.cpp
index 03c150f..8d21ca5 100644
--- a/llvm/lib/Support/ARMWinEH.cpp
+++ b/llvm/lib/Support/ARMWinEH.cpp
@@ -32,7 +32,7 @@
 
   return std::make_pair(GPRMask, VFPMask);
 }
-}
-}
-}
+} // namespace WinEH
+} // namespace ARM
+} // namespace llvm