7c7c52ecd1
Get rid of `mir::Const::from_ty_const` This function is strange, because it turns valtrees into `mir::Const::Value`, but the rest of the const variants stay as type system consts. All of the callsites except for one in `instsimplify` (array length simplification of `ptr_metadata` call) just go through the valtree arm of the function, so it's easier to just create a `mir::Const` directly for those. For the instsimplify case, if we have a type system const we should *keep* having a type system const, rather than turning it into a `mir::Const::Value`; it doesn't really matter in practice, though, bc `usize` has no padding, but it feels more principled.
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