[llvm] [AMDGPU] Account for existing SDWA selections (PR #123221)

[Frederik Harwath via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 5
+# RUN: llc -mtriple=amdgcn -mcpu=gfx1030 -simplify-mir -run-pass=si-peephole-sdwa -o - %s | FileCheck %s
+
+# Test the combination of SDWA selections in si-peephole-sdwa. In each
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frederik-h wrote:

No. I considered this to "demonstrate all different selection combinations" as I wrote in another comment and those are the same for the source and destination selections. Do you think we need to add a dedicated test for the dst selections?

https://github.com/llvm/llvm-project/pull/123221