[llvm] [AMDGPU] Introduce a pseudo mnemonic for S_DELAY_ALU in MIR. (PR #96004)

[Matt Arsenault via llvm-commits]

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+# RUN: llc -mtriple=amdgcn -mcpu=gfx1100 -mattr=-wavefrontsize32,+wavefrontsize64 -verify-machineinstrs -start-after=amdgpu-insert-delay-alu %s -o - | FileCheck %s
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arsenm wrote:

Parser tests should go in test/CodeGen/MIR/AMDGPU, and use run-pass=none 

https://github.com/llvm/llvm-project/pull/96004