Auto merge of #140053 - ChrisDenton:rollup-tt00skl, r=ChrisDenton

Rollup of 7 pull requests

Successful merges:

 - #139042 (Do not remove trivial `SwitchInt` in analysis MIR)
 - #139533 (add next_index to Enumerate)
 - #139843 (Setup editor file associations for non-rs extensions)
 - #140000 (skip llvm-config in autodiff check builds, when its unavailable)
 - #140008 (Improve `clean_maybe_renamed_item` function code a bit)
 - #140024 (Remove early exits from JumpThreading.)
 - #140039 (Add option for stable backport poll)

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