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Auto merge of #125892 - workingjubilee:rollup-gytt1q7, r=workingjubilee
Rollup of 3 pull requests
Successful merges:
- #125311 (Make repr(packed) vectors work with SIMD intrinsics)
- #125849 (Migrate `run-make/emit-named-files` to `rmake.rs`)
- #125851 (Add some more specific checks to the MIR validator)
r? `@ghost`
`@rustbot` modify labels: rollup
