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/Transforms/IPO/DeadArgumentElimination.cpp b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
index 6bfd3d1..76898f2 100644
--- a/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
+++ b/llvm/lib/Transforms/IPO/DeadArgumentElimination.cpp
@@ -159,7 +159,7 @@
     bool DeleteDeadVarargs(Function &Fn);
     bool RemoveDeadArgumentsFromCallers(Function &Fn);
   };
-} // namespace
+}
 
 
 char DAE::ID = 0;
@@ -175,7 +175,7 @@
 
     bool ShouldHackArguments() const override { return true; }
   };
-} // namespace
+}
 
 char DAH::ID = 0;
 INITIALIZE_PASS(DAH, "deadarghaX0r",