This recommits a87fccb3ff9c with a fix to mark the destination operand of the marker instruction as def, to fix a machine verifier failure. This reverts the revert commit c0f2cea7c0afc7c9688e1633f2a9b25c8ea4a9bd.
This recommits a87fccb3ff9c with a fix to mark the destination operand of the marker instruction as def, to fix a machine verifier failure. This reverts the revert commit c0f2cea7c0afc7c9688e1633f2a9b25c8ea4a9bd.