WIP: Use TTG for HsRecFld and HsRnBracketOut
HsRecFld and HsRnBracketOut can occur only in GhcRn phase, this moves them to XExpr.
Part of #16830 (closed).
Blocked: this is now a WIP because Quick Look changes HsRecFld. Let's hold for now.
Edited by John Ericson