[Perf] Linux/x64: 3 Regressions on 3/25/2026 4:20:06 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [6d3044db47fc5161841ba54317feed1122c132a9](https://github.com/dotnet/runtime/commit/6d3044db47fc5161841ba54317feed1122c132a9)
Compare | [91557f54f15bac8fbb5c7acf994910cbd6071991](https://github.com/dotnet/runtime/commit/91557f54f15bac8fbb5c7acf994910cbd6071991)
Diff | [Diff](https://github.com/dotnet/runtime/compare/6d3044db47fc5161841ba54317feed1122c132a9...91557f54f15bac8fbb5c7acf994910cbd6071991)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.Perf_Frozen<ReferenceType>

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

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

| 18.08 μs | 25.65 μs | 1.42 | 0.43 | False | | |
|

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

| 7.86 μs | 10.70 μs | 1.36 | 0.27 | False | | |
|

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

| 1.96 ms | 2.95 ms | 1.50 | 0.42 | 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.Collections.Perf_Frozen*'
```

### System.Collections.Perf_Frozen<ReferenceType>.Contains_True(Count: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_Frozen<ReferenceType>.ToFrozenDictionary(Count: 4)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_Frozen<ReferenceType>.Contains_True(Count: 512)

#### 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)