Fold PathString aspnet pattern

[EgorBo]

private static readonly PathString _path = new PathString(Scenarios.GetPath(s => s.DbFortunesRaw));

public Task Invoke(HttpContext httpContext)
{
    if (httpContext.Request.Path.StartsWithSegments(_path, StringComparison.Ordinal))
    {
        // ..
    }
}

It seems to be a popular pattern in aspnet benchmarks so ideally we should be able to unroll this StartsWithSegments since _path is static readonly thus we know the _path final length (e.g. _path.Value.Length; is already folded to a const in Tier1). It's possible that it can be done even today with a bit of C# massage in aspnet, but I'm not sure.

Needs #84524 first

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Issue Details

---

private static readonly PathString _path = new PathString(Scenarios.GetPath(s => s.DbFortunesRaw));

public Task Invoke(HttpContext httpContext)
{
    if (httpContext.Request.Path.StartsWithSegments(_path, StringComparison.Ordinal))
    {
        // ..
    }
}

It seems to be a popular pattern in aspnet benchmarks so ideally we should be able to unroll this StartsWithSegments. It's possible that it can be done even today with a bit of C# massage in aspnet, but I'm not sure

Author:	EgorBo
Assignees:	-
Labels:	tenet-performance, area-CodeGen-coreclr, untriaged
Milestone:	-