[VPlan] Switch to checking sinking legality for recurrences in VPlan.

Building on D142885 and D142589, retire the SinkAfter map from the
recurrence handling code. It is replaced by checking whether it is
possible to sink all users of a recurrence directly in VPlan. This
results in simpler code overall and allows to handle additional cases
(see the improvements in @test_crash).

Depends on D142885.
Depends on D142589.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D142886