BitSet can cause exceptions on certain platforms

[metalgearsloth]

Thanks to @PJB3005 for pointing me towards the environment variables to test.

We tried testing Arch on one of our servers that doesn't have avx2 enabled but it was causing crashes on live. Running with the env var DOTNET_EnableAVX2=0 set locally can easily reproduce the issue, at least for us.

[genaray]

Any prefered way to activate the environment variables?
Just tried it with : Environment.SetEnvironmentVariable("DOTNET_EnableAVX2", "0"); without any luck.

Guess i also need to add a bunch of components until the simd kicks in.