[llvm] AMDGPU/GlobalISel: Lower G_EXTRACT/INSERT in legalizer (PR #181036)

[Petar Avramovic via llvm-commits]

https://github.com/petar-avramovic commented:

Think you were supposed to remove inst-select-insert.mir, not legalize-insert.mir 

https://github.com/llvm/llvm-project/pull/181036