Auto merge of #113391 - fee1-dead-contrib:rollup-9bqlw9z, r=fee1-dead

Rollup of 9 pull requests

Successful merges:

 - #111119 (style-guide: Add chapter about formatting for nightly-only syntax)
 - #112791 (llvm ffi: Expose `CallInst->setTailCallKind`)
 - #113145 (style-guide: Document newline rules for assignment operators)
 - #113163 (Add a regression test for #112895)
 - #113332 (resolve: Use `Interned` for some interned structures)
 - #113334 (Revert the lexing of `c"…"` string literals)
 - #113350 (Fix the issue of wrong diagnosis for extern pub fn)
 - #113371 (Fix submodule handling when the current branch is named after a tag)
 - #113384 (style-guide: Clarify grammar for small patterns (not a semantic change))

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

Author: bors