target tier policy: require ability to produce object code #115217
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Update target tier policy to require that targets be able to produce object code with a supported backend.
In the discussions around rust-lang/compiler-team#655, there was an open question of what exact requirement to make of tier three targets should be - require a test producing assembly which can be cross-compiled, or just require that it is possible at all. I've opted for the latter in this pull request, just because that's simpler to start with, once we have assembly tests for every existing target, we could update this.
r? @wesleywiser