Add Perf_String_Substring_* benchmarks

[nietras]

Draft benchmarks for Substring. cc @adamsitnik feel free to make any changes you like right away. For some reason I can no longer built this after updating latest main. In relation to dotnet/runtime#62577

[nietras]

probably will delete this change, so ignore it

[nietras]

not sure these are of any interest but they showed that with the new changes the JIT can fully compile away substring code compared to before

[nietras]

build errors

C:\git\oss\performance\src\benchmarks\micro\Serializers\Binary_FromStream.cs(39,13): error SYSLIB0011: 'BinaryFormatter.Serialize(Stream, object)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' [C:\git\oss\performance\src\benchmarks\micro\MicroBenchmarks.csproj]
C:\git\oss\performance\src\benchmarks\micro\Serializers\Binary_FromStream.cs(61,23): error SYSLIB0011: 'BinaryFormatter.Deserialize(Stream)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' [C:\git\oss\performance\src\benchmarks\micro\MicroBenchmarks.csproj]
C:\git\oss\performance\src\benchmarks\micro\Serializers\Binary_ToStream.cs(40,13): error SYSLIB0011: 'BinaryFormatter.Serialize(Stream, object)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' [C:\git\oss\performance\src\benchmarks\micro\MicroBenchmarks.csproj]
C:\git\oss\performance\src\benchmarks\micro\libraries\System.Runtime.Serialization.Formatters\Perf.BinaryFormatter.cs(30,13): error SYSLIB0011: 'BinaryFormatter.Serialize(Stream, object)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' [C:\git\oss\performance\src\benchmarks\micro\MicroBenchmarks.csproj]
C:\git\oss\performance\src\benchmarks\micro\libraries\System.Runtime.Serialization.Formatters\Perf.BinaryFormatter.cs(38,32): error SYSLIB0011: 'BinaryFormatter.Deserialize(Stream)' is obsolete: 'BinaryFormatter serialization is obsolete and should not be used. See https://aka.ms/binaryformatter for more information.' [C:\git\oss\performance\src\benchmarks\micro\MicroBenchmarks.csproj]

[danmoseley]

Not sure why those build failures don't show up when I build locally. There should be something like this suppressing them though.
https://github.com/dotnet/runtime/blob/03e90a540cb2dfe5cab4086ea54ad5dd1f655749/src/libraries/System.Runtime/tests/System/ExceptionTests.cs#L238-L237

[nietras]

Suppressed the warning in the places this was missing. See PR. Then getting assets issue:

C:\Program Files\dotnet\sdk\7.0.100-alpha.1.21568.2\Sdks\Microsoft.NET.Sdk\targets\Microsoft.PackageDependencyResolution.targets(267,5): error NETSDK1005: Assets file 'C:\git\oss\performance\artifacts\obj\MicroBenchmarks\project.assets.json' doesn't have a target for 'net6.0'. Ensure that restore has run and that you have included 'net6.0' in the TargetFrameworks for your project. [C:\git\oss\performance\src\benchmarks\micro\MicroBenchmarks.csproj]

so switched to netcoreapp5.0 in compilation. Tried rebuilding, cleaning, restoring didn't help. Didn't have these issues before updating to latest main.

[nietras]

Reported some results in dotnet/runtime#62577 (comment)

[danmoseley]

@nietras checking in on this one, do you believe it's ready to review (after resolving conflicts)?

[danmoseley]

@nietras I'm closing this one as it seems that string.Substring(int) and string.Substring(int, int) are already covered very similarly. Please let me know if that's not the case.