[InstUtils] Look through move as ownership inst.

Add move_value to the list of ownership instructions through which
lookThroughOwnershipInsts looks.

Author: nate-chandler

lib/SIL/Utils/InstructionUtils.cpp

@@ -31,6 +31,7 @@ SILValue swift::lookThroughOwnershipInsts(SILValue v) {
     switch (v->getKind()) {
     default:
       return v;
+    case ValueKind::MoveValueInst:
     case ValueKind::CopyValueInst:
     case ValueKind::BeginBorrowInst:
       v = cast<SingleValueInstruction>(v)->getOperand(0);