Auto merge of #116013 - matthiaskrgr:rollup-mv5i4fd, r=matthiaskrgr

Rollup of 4 pull requests

Successful merges:

 - #114394 (style-guide: Document formatting of `as` casts (mostly like a binary operator))
 - #115990 (Allow anyone to set llvm-fixed-upstream)
 - #116008 (Rename BoxMeUp to PanicPayload.)
 - #116011 (Update browser-ui-test version to 0.16.10)

r? `@ghost`
`@rustbot` modify labels: rollup