[llvm] [AMDGPU] NFC. Add test for debug info on CFG annotation instructions. (PR #73959)

[Matt Arsenault via llvm-commits]

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+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 4
+; RUN: opt -mtriple=amdgcn-- -S -structurizecfg -si-annotate-control-flow %s | FileCheck -check-prefix=OPT %s
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arsenm wrote:

I expected this to use new PM, but it looks like is-annotate-control-flow hasn't been ported yet 

https://github.com/llvm/llvm-project/pull/73959