[Perf] Linux/x64: 1 Regression on 3/30/2026 1:16:14 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [cb0a046c48e317b06eedae0dee88b114457b6f00](https://github.com/dotnet/runtime/commit/cb0a046c48e317b06eedae0dee88b114457b6f00)
Compare | [d5a420411ca542fd66986cbe5f168b929bc1b0de](https://github.com/dotnet/runtime/commit/d5a420411ca542fd66986cbe5f168b929bc1b0de)
Diff | [Diff](https://github.com/dotnet/runtime/compare/cb0a046c48e317b06eedae0dee88b114457b6f00...d5a420411ca542fd66986cbe5f168b929bc1b0de)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.IO.Tests.Perf_File

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

• [AppendAllText - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 784.03 μs | 923.05 μs | 1.18 | 0.23 | False | | |

[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.IO.Tests.Perf_File*'
```

### System.IO.Tests.Perf_File.AppendAllText(size: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)