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/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index 141990b..2969bad 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -179,7 +179,7 @@
   /// in-loop predecessors of this chain.
   unsigned LoopPredecessors;
 };
-} // namespace
+}
 
 namespace {
 class MachineBlockPlacement : public MachineFunctionPass {
@@ -267,7 +267,7 @@
     MachineFunctionPass::getAnalysisUsage(AU);
   }
 };
-} // namespace
+}
 
 char MachineBlockPlacement::ID = 0;
 char &llvm::MachineBlockPlacementID = MachineBlockPlacement::ID;
@@ -1185,7 +1185,7 @@
     MachineFunctionPass::getAnalysisUsage(AU);
   }
 };
-} // namespace
+}
 
 char MachineBlockPlacementStats::ID = 0;
 char &llvm::MachineBlockPlacementStatsID = MachineBlockPlacementStats::ID;