Auto merge of #65087 - Centril:rollup-skxq0zr, r=Centril

Rollup of 5 pull requests

Successful merges:

 - #64749 (Fix most remaining Polonius test differences)
 - #64817 (Replace ClosureSubsts with SubstsRef)
 - #64874 (Simplify ExprUseVisitor)
 - #65026 (metadata: Some crate loading cleanup)
 - #65073 (Remove `borrowck_graphviz_postflow` from test)

Failed merges:

r? @ghost