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[AMDGPU][GlobalISel] Fix 96 and 128 local loads and stores

Authored by mbrkusanin on Aug 21 2020, 2:42 AM.

Description

[AMDGPU][GlobalISel] Fix 96 and 128 local loads and stores

Fix local ds_read/write_b96/b128 so they can be selected if the alignment
allows. Otherwise, either pick appropriate ds_read2/write2 instructions or break
them down.

Differential Revision: https://reviews.llvm.org/D81638