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/Analysis/LazyValueInfo.cpp b/llvm/lib/Analysis/LazyValueInfo.cpp
index a6ae7f2..f421d28 100644
--- a/llvm/lib/Analysis/LazyValueInfo.cpp
+++ b/llvm/lib/Analysis/LazyValueInfo.cpp
@@ -286,7 +286,7 @@
               << Val.getConstantRange().getUpper() << '>';
   return OS << "constant<" << *Val.getConstant() << '>';
 }
-}
+} // namespace llvm
 
 //===----------------------------------------------------------------------===//
 //                          LazyValueInfoCache Decl
@@ -306,7 +306,7 @@
       deleted();
     }
   };
-}
+} // namespace
 
 namespace { 
   /// This is the cache kept by LazyValueInfo which