Rollup of 8 pull requests

Successful merges:

 - #144034 (tests: Test line number in debuginfo for diverging function calls)
 - #144510 (Fix Ord, Eq and Hash implementation of panic::Location)
 - #144583 (Enable T-compiler backport nomination)
 - #144586 (Update wasi-sdk to 27.0 in CI)
 - #144605 (Resolve: cachify `ExternPreludeEntry.binding` through a `Cell`)
 - #144632 (Update some tests for LLVM 21)
 - #144639 (Update rustc-perf submodule)
 - #144640 (Add support for the m68k architecture in 'object_architecture')

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

Rollup merge of #144583 - apiraino:enable-t-compiler-backport-nomination, r=jieyouxu,Urgau

Enable T-compiler backport nomination

This patches the triagebot.toml so that it will trigger a backport label on pull requests fixing regressions. Applying a backport label will trigger creating a Zulip thread. For now the configuration only for `T-compiler` labeled regressions.

Comments in the code explain how it works. Documentation [on the forge](https://forge.rust-lang.org/triagebot/backport.html).

```
[backport.foo]

# The pull request MUST have one of these labels
required_pr_labels = ["T-compiler"]

# The regression MUST have this label
required_issue_label = "regression-from-stable-to-beta"

# if the above conditions matches, the PR will receive these labels
add_labels = ["beta-nominated"]
```

Anything to think about before merging this?

thanks for a review