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Make `validate_mir` ensure the final MIR for all bodies A lot of the crashes tests use `-Zpolymorphize` or `-Zdump-mir` for their side effect of computing the `optimized_mir` for all bodies, which will uncover bugs with late MIR passes like the inliner. I don't like having all these tests depend on `-Zpolymorphize` (or other hacky ways) for no reason, so this PR extends the `-Zvalidate-mir` flag to ensure `optimized_mir`/`mir_for_ctfe` for all body owners during the analysis phase. Two thoughts: 1. This could be moved later in the compilation pipeline I guess? I don't really think it matters, though. 1. This could alternatively be expressed using a new flag, though I don't necessarily see much value in separating these. For example, #128171 could have used this flag, in the `tests/ui/polymorphization/inline-incorrect-early-bound.rs`. r? mir