Find some way to make system.debug replicate through into 32bit execution

[ChrisLGardner]

Bringing over from https://github.com/rfennell/AzurePipelines/issues/334

If a user wants to run in 32bit process and has set system.debug = $true then we should try to replicate that across to the new process.

Not entirely sure how we can make that work but there might be some options with passing environment variables into the new session.