Auto merge of #78035 - camelid:basic-block-pointer-note, r=RalfJung
Auto merge of #78035 - camelid:basic-block-pointer-note, r=RalfJung

Note that `BasicBlock` is just an index

r? `@RalfJung`

aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust,aidancully/rust,graydon/rust,aidancully/rust,graydon/rust,graydon/rust