Enable the latest managed pgo data

[davidwrighton]

• Implementation is parallel to existing ibc handling, so that it can be toggled on/off by adjusting the UsingToolIbcOptimization property
• Use the same data for all assemblies produced in current build
• Apply data to release builds only
• Disable mismatch assertions in jit for current state where il mismatches are common

[ghost]

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

[davidwrighton]

@dotnet/crossgen-contrib
@agocke

[AndyAyersMS]

Jit changes ok (per offline discussion).

This data flows through to jitting (right?). If so we might want to look at what happens to jit codegen. I can do that separately though.

[mangod9]

Since IBC is currently not used/supported should that code be removed?

[trylek]

LGTM, thank you! Just for my curiosity, do the MIBC data restoration failures mean we first need to somehow seed the optimization data or are we going to need to make the restoration optional?

[Lxiamail]

Is nuget package "optimization.MIBC.Runtime.99.99.99-master-20210317.2.nupkg" needed anywhere?

[davidwrighton]

Ideally the complex logic that is used to choose which one of these applies to a given platform will change to use the non-arch specific nuget package, but for now I just made it work without it.

[AndyAyersMS]

@DrewScoggins @adamsitnik

FYI, this PR may lead to widespread changes in benchmark perf as static PGO data will now be available to the jit for some assemblies. Hopefully, many many improvements...