Replace std::copy with a back inserter with vector append where feasible

All of the cases were just appending from random access iterators to a
vector. Using insert/append can grow the vector to the perfect size
directly and moves the growing out of the loop. No intended functionalty
change.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230845 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/AsmMatcherEmitter.cpp

@@ -1447,8 +1447,9 @@ void AsmMatcherInfo::buildInfo() {
       II->buildAliasResultOperands();
   }
   if (!NewMatchables.empty())
-    std::move(NewMatchables.begin(), NewMatchables.end(),
-              std::back_inserter(Matchables));
+    Matchables.insert(Matchables.end(),
+                      std::make_move_iterator(NewMatchables.begin()),
+                      std::make_move_iterator(NewMatchables.end()));
 
   // Process token alias definitions and set up the associated superclass
   // information.