[PATCH] D156422: AMDGPU: Always custom lower extract_subvector

[Matt Arsenault via Phabricator via llvm-commits]

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The patterns were ripped out in
a4a3ac10cb1a40ccebed4e81cd7e94f1eb71602d <https://reviews.llvm.org/rGa4a3ac10cb1a40ccebed4e81cd7e94f1eb71602d> so this always needs to be
custom lowered. I absolutely hate how difficult it is to write tests
for these, I have no doubt there are more of these hidden.

      

Fixes #64142


https://reviews.llvm.org/D156422

Files:
  llvm/lib/Target/AMDGPU/SIISelLowering.cpp
  llvm/test/CodeGen/AMDGPU/extract-subvector-16bit.ll

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