Use IndexOfAnyValues in Uri

[MihaZupan]

Contributes to #78204

There are more places we can use IndexOfAnyValues in System.Uri. I'll address those in future PRs to keep them reviewable, this is complex enough as it is.

Method	Toolchain	Input	Mean	Error	Ratio	Allocated
NewUriIdnHost	main	http://aaaaaaaa(...) [50]	428.2 ns	2.98 ns	1.00	240 B
NewUriIdnHost	pr	http://aaaaaaaa(...) [50]	314.0 ns	1.31 ns	0.73	240 B
NewUriIdnHost	main	http://www.Micr(...) [28]	254.3 ns	1.29 ns	1.00	248 B
NewUriIdnHost	pr	http://www.Micr(...) [28]	232.2 ns	0.67 ns	0.91	192 B
NewUriIdnHost	main	http://www.micr(...) [28]	240.6 ns	1.09 ns	1.00	192 B
NewUriIdnHost	pr	http://www.micr(...) [28]	224.2 ns	0.64 ns	0.93	192 B

Benchmark code

[MemoryDiagnoser]
public class UriBenchmarks
{
    public static IEnumerable<string> Inputs()
    {
        yield return "http://www.microsoft.com/foo";
        yield return "http://www.Microsoft.com/foo";
        yield return $"http://{string.Concat(Enumerable.Repeat(new string('a', 12) + '.', 3))}/foo";
    }

    [ParamsSource(nameof(Inputs))]
    public string Input;

    [Benchmark]
    public string NewUriIdnHost() => new Uri(Input).IdnHost;
}

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Issue Details

---

Contributes to #78204

There are more places we can use IndexOfAnyValues in System.Uri. I'll address those in future PRs to keep them reviewable, this is complex enough as it is.

Author:	MihaZupan
Assignees:	-
Labels:	area-System.Net
Milestone:	8.0.0

[MihaZupan]

The iri parameter is always constant, so we could handle the differences with a generic, e.g.

private interface IIsValidImpl
{
    static abstract int IndexOfInvalidOrDelimiterChar(ReadOnlySpan<char> chars);
    static abstract bool CheckFirstLabelCharacter(char c);
    static abstract int DotIndex(ReadOnlySpan<char> chars);
    static abstract int CalculateLabelLength(ReadOnlySpan<char> label);
}

but it seemed like it was adding more code than it's worth (although arguably more readable?).

[stephentoub]

ParseCanonicalName is handed already sanitized data?

[MihaZupan]

Yes