[PATCH][RFC] Come up with casm state

[Martin Liška]

Hi.

We're considering with Richi some changes related to how we emit early debug info.
That would probably include changes where the debug info would be streamed to a separate
file (different from normal .o output file).

That said, we would need switching in between output assembly files. The patch I'm sending
is a first step and we would like to receive a comments about the chosen approach?

Richi, do you want to add something?

Cheers,
Martin
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