.NET 5 TargetFramework usage

[sfoslund]

With .NET 5 we are introducing a new style of target framework that includes target platform information (for example, net5.0-windows). This repo contains logic that will break with these new target frameworks, specifically, see this line: https://github.com/dotnet/performance/blob/master/src/benchmarks/real-world/JitBench/Store/CreateStore/bugfix_sdk_1682/Microsoft.NET.ComposeStore.targets#L431.
The TargetFrameworkMoniker cannot be used in place of the TargetFramework as the target framework moniker does not contain required platform information and will likely fail with new .NET 5 target frameworks like net5.0-windows. Please test and ensure that this target does not break .NET 5 scenarios, thanks!

[adamsitnik]

Hi @sfoslund

Thank you for the heads-up!

The benchmarks from this particular folder are not used anymore so we should be fine.

@billwert should we consider removing these benchmarks as this is not the first time when they cause confusion (#497)?

FWIW the harness that we use for micro-benchmarking (BenchmarkDotNet) is going to support the platform-specific TFMs with the next release: dotnet/BenchmarkDotNet#1560

[billwert]

Great idea @adamsitnik. thanks @sfoslund!