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[SLP]Need shrink the load vector after reordering.

Authored by ABataev on Jan 1 2021, 8:43 AM.

Description

[SLP]Need shrink the load vector after reordering.

After merging the shuffles, we cannot rely on the previous shuffle
anymore and need to shrink the final shuffle, if it is required.

Reported in D92668

Differential Revision: https://reviews.llvm.org/D93967