Port TimeZoneInfo cleanups from CoreCLR

[jkotas]

dotnet/coreclr#8512
dotnet/coreclr#8513
dotnet/coreclr#8526
dotnet/coreclr#8527
dotnet/coreclr#8528
dotnet/coreclr#8529
dotnet/coreclr#8530
dotnet/coreclr#8540
dotnet/coreclr#8575

[jkotas]

cc @tarekgh @DnlHarvey

@justinvp Would you like to take care of these ports?

[tarekgh]

@DnlHarvey could you please help with the port?
I assigned the issue to you, let me know if you can't do it so I can try to schedule doing it.

[justinvp]

I can take care of porting these. I might not get to it for a few days, though.

[tarekgh]

thanks @justinvp

[jamesqo]

Maybe this can be closed? The associated PR was merged.

[justinvp]

dotnet/coreclr#8512 still needs to be ported in a separate PR

[tarekgh]

I re-opened it but it would be better to track the porting on corert branch.

[justinvp]

it would be better to track the porting on corert branch.

Not sure what you mean. This issue is in the corert repo for work that needs to happen in corert.

dotnet/coreclr#8512 is the only remaining item to port. It's not a straightforward port like the others as it requires some minor refactoring due to differences in the implementation. I started working on it.

[tarekgh]

@justinvp never mind.