Test inlining changes for CredentialCache perf

[MihaZupan]

#124520

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[MihaZupan]

@EgorBot -profiler -linux_azure_arm

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;
using System;
using System.Net;

public class CredentialCacheTests
{
    private const string UriPrefix = "http://name";
    private const string AuthenticationType = "authType";

    private static readonly NetworkCredential s_credential = new();
    private static readonly CredentialCache _cache = CreateCredentialCache(10);

    private readonly string _uriString = "http://name5";
    private Uri? _reusedUri;

    [Benchmark]
    public NetworkCredential GetCredential_Uri() => _cache.GetCredential(new Uri(_uriString), AuthenticationType);

    private static CredentialCache CreateCredentialCache(int uriCount)
    {
        var cc = new CredentialCache();

        for (int i = 0; i < uriCount; i++)
        {
            Uri uri = new Uri(UriPrefix + i.ToString());
            cc.Add(uri, AuthenticationType, s_credential);
        }

        return cc;
    }
}

[Copilot]

Pull request overview

This pull request adds a [MethodImpl(MethodImplOptions.NoInlining)] attribute to the IsPrefix method in CredentialCacheKey to investigate potential performance improvements for the GetCredential_Uri benchmark, which showed a 35% regression (309ns → 418ns) according to issue #124520. The change prevents the JIT compiler from inlining this method into its caller.

Changes:

• Added NoInlining attribute to the IsPrefix method to test if preventing inlining resolves the performance regression