Auto merge of #119927 - matthiaskrgr:rollup-885ws57, r=matthiaskrgr

Rollup of 6 pull requests

Successful merges:

 - #119587 (Varargs support for system ABI)
 - #119891 (rename `reported_signature_mismatch` to reflect its use)
 - #119894 (Allow `~const` on associated type bounds again)
 - #119896 (Taint `_` placeholder types in trait impl method signatures)
 - #119898 (Remove unused `ErrorReporting` variant from overflow handling)
 - #119902 (fix typo in `fn()` docs)

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

Author: bors