Produce PrimValKinds for small, simple layout ADTs.
Produce PrimValKinds for small, simple layout ADTs.

aidancully/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,GBGamer/rust,rust-lang/miri,graydon/rust,GBGamer/rust,aidancully/rust,GBGamer/rust,aidancully/rust,rust-lang/miri,rust-lang/miri,GBGamer/rust,graydon/rust,graydon/rust,rust-lang/miri,tsion/miri,graydon/rust,graydon/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,GBGamer/rust