None of the `PointerCoercion`s had any, so while there's probably more that could be done here, hopefully these are better than the previous nothing.

…rinsics, r=workingjubilee

Make repr(packed) vectors work with SIMD intrinsics

In rust-lang#117116 I fixed `#[repr(packed, simd)]` by doing the expected thing and removing padding from the layout.  This should be the last step in providing a solution to rust-lang/portable-simd#319

…files, r=jieyouxu

Migrate `run-make/emit-named-files` to `rmake.rs`

Part of rust-lang#121876.

r? `@jieyouxu`

…-errors

Add some more specific checks to the MIR validator

None of the `PointerCoercion`s had any checks, so while there's probably more that could be done here, hopefully these are better than the previous nothing.

r? mir