[LV] Remove redundant IV casts using VPlan (NFCI).

This patch simplifies handling of redundant induction casts, by
removing dead cast instructions after initial VPlan construction.
This has the following benefits:

  1. fixes a crash
     (see @test_optimized_cast_induction_feeding_first_order_recurrence)
  2. Simplifies VPWidenIntOrFpInduction to a single-def recipes
  3. Retires recordVectorLoopValueForInductionCast.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D115112