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[AArch64][SVE] Lower index_vector to step_vector

Authored by junparser on Apr 19 2021, 7:51 PM.

Description

[AArch64][SVE] Lower index_vector to step_vector

As discussed in D100107, this patch first convert index_vector to
step_vector, and convert step_vector back to index_vector after LegalizeDAG.

Differential Revision: https://reviews.llvm.org/D100816