[SelectionDAG] Use promoted types when creating nodes after type legalization (#178617)
When creating new nodes with illegal types after type legalization, we
should try to use promoted type to avoid creating nodes with illegal
types.
Fixes: https://github.com/llvm/llvm-project/issues/177155
(cherry picked from commit 38e280d8a405bb442d176b8dab18da63d3fc2810)