Auto merge of #133345 - GuillaumeGomez:stop-cloning-context, r=notriddle,aDotInTheVoid

Stop cloning `Context` so much

This is a first step for https://github.com/rust-lang/rust/issues/82381.

It's already big enough so I'll continue in a follow-up once this PR is merged. Next step will be to get rid of `SharedContext` by inlining it directly into `Context`.

cc `@camelid`
r? `@notriddle`