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[ARM] Turn sext_inreg(VGetLaneu) into VGetLaneu

Authored by dmgreen on Feb 1 2021, 3:10 AM.

Description

[ARM] Turn sext_inreg(VGetLaneu) into VGetLaneu

This adds a DAG combine for converting sext_inreg of VGetLaneu into
VGetLanes, providing the types match correctly.

Differential Revision: https://reviews.llvm.org/D95073