[llvm] [AMDGPU][InstCombine] Optimize constant shuffle patterns (PR #192246)

[Juan Manuel Martinez Caamaño via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -passes=instcombine -S < %s | FileCheck %s --check-prefixes=GFX11
+; RUN: opt -mtriple=amdgcn-amd-amdhsa -mcpu=gfx1100 -mattr=+wavefrontsize64 -passes=instcombine -S < %s | FileCheck %s --check-prefixes=GFX11-W64
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jmmartinez wrote:

Should we repeat the tests for a target without dpp and for a target pre-gfx10 ?

https://github.com/llvm/llvm-project/pull/192246