Rollup merge of #125708 - RalfJung:tier3, r=compiler-errors

tier 3 target policy: clarify the point about producing assembly

I think that is already the intended meaning of the policy, but I am not sure.

Cc ``@rust-lang/compiler``
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Matthias Krüger 2024-05-29 20:12:34 +02:00 committed by GitHub
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@ -247,7 +247,8 @@ approved by the appropriate team for that shared code before acceptance.
target may not have; use conditional compilation or runtime detection, as
appropriate, to let each target run code supported by that target.
- Tier 3 targets must be able to produce assembly using at least one of
rustc's supported backends from any host target.
rustc's supported backends from any host target. (Having support in a fork
of the backend is not sufficient, it must be upstream.)
If a tier 3 target stops meeting these requirements, or the target maintainers
no longer have interest or time, or the target shows no signs of activity and