Remove IndexBuildCallback's dependency on HeapTuple

When Who What
2019-11-09 00:45:08 Michael Paquier (michael-kun) Closed in commitfest 2019-11 with status: Committed
2019-11-09 00:45:08 Michael Paquier (michael-kun) Changed committer to andresfreund
2019-11-07 08:02:47 Michael Paquier (michael-kun) New status: Ready for Committer
2019-09-30 19:00:02 Álvaro Herrera (alvherre) Closed in commitfest 2019-09 with status: Moved to next CF
2019-08-12 18:42:17 Ashwin Agrawal (ashwinstar) Changed authors to Ashwin Agrawal (ashwinstar)
2019-08-12 18:42:03 Ashwin Agrawal (ashwinstar) Attached mail thread CA+TgmoYgwjmmjK24Qxb_vWAu8_Hh7gfVFcr3+R7ocdLvYOWJXg@mail.gmail.com
2019-08-12 18:42:03 Ashwin Agrawal (ashwinstar) Created patch record