[VPlan] Handle AnyOf when unrolling. (#145340)
Currently AnyOf is not handled correctly during unrolling. This is
currently causing mis-compiles when vectorizing early-exit loops with
interleaving forced (even though selectInterleaveCount will currently
only pick IC = 1, unless forced by the user).
This patch updates handling of AnyOf to be analogous to computing final
reduction results: during unrolling, the created copies for its original
operand are added as additional operands, and AnyOf will always produce
the reduced value across all unrolled iterations.
Note that the generated code is still incorrect, as we also need to
handle FirstActiveLane and ExtractElement with FirstActiveLane operands.
I will share patches for those soon as well.
PR: https://github.com/llvm/llvm-project/pull/145340
