[Instruction] Add missing implementation for moveAfter(InstListType::iterator)

Author: kammt

llvm/lib/IR/Instruction.cpp

@@ -197,6 +197,13 @@ void Instruction::moveAfter(Instruction *MovePos) {
   moveBeforeImpl(*MovePos->getParent(), NextIt, false);
 }
 
+void Instruction::moveAfter(InstListType::iterator MovePos) {
+  // We want this instruction to be moved to before NextIt in the instruction
+  // list, but before NextIt's debug value range.
+  MovePos.setHeadBit(true);
+  moveBeforeImpl(*MovePos->getParent(), MovePos, false);
+}
+
 void Instruction::moveAfterPreserving(Instruction *MovePos) {
   auto NextIt = std::next(MovePos->getIterator());
   // We want this instruction and its debug range to be moved to before NextIt