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!



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@240137 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Utils/SimplifyCFG.cpp

@@ -136,7 +136,7 @@ public:
       : TTI(TTI), DL(DL), BonusInstThreshold(BonusInstThreshold), AC(AC) {}
   bool run(BasicBlock *BB);
 };
-}
+} // namespace
 
 /// SafeToMergeTerminators - Return true if it is safe to merge these two
 /// terminator instructions together.
@@ -502,7 +502,7 @@ private:
   }
 };
 
-}
+} // namespace
 
 static void EraseTerminatorInstAndDCECond(TerminatorInst *TI) {
   Instruction *Cond = nullptr;
@@ -3717,7 +3717,7 @@ namespace {
     // For ArrayKind, this is the array.
     GlobalVariable *Array;
   };
-}
+} // namespace
 
 SwitchLookupTable::SwitchLookupTable(
     Module &M, uint64_t TableSize, ConstantInt *Offset,