[llvm] [AMDGPU] Model ordered XDL writes in expert scheduling (PR #218326)

[Matt Arsenault via llvm-commits]

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+# NOTE: Assertions have been autogenerated by utils/update_mir_test_checks.py UTC_ARGS: --version 6
+# RUN: llc -mtriple=amdgcn -mcpu=gfx1250 -verify-machineinstrs -amdgpu-expert-scheduling-mode -run-pass si-insert-waitcnts %s -o - | FileCheck %s
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arsenm wrote:

```suggestion
# RUN: llc -mtriple=amdgpu12.50-amdgpu-expert-scheduling-mode -run-pass si-insert-waitcnts %s -o - | FileCheck %s
```

https://github.com/llvm/llvm-project/pull/218326