download_ci_llvm test failure when updating LLVM

[nikic]

From #131293 (comment):

2024-10-05T14:07:30.4627940Z failures:
2024-10-05T14:07:30.4628774Z 
2024-10-05T14:07:30.4629533Z ---- core::config::tests::download_ci_llvm stdout ----
2024-10-05T14:07:30.4630298Z thread 'core::config::tests::download_ci_llvm' panicked at src/core/config/tests.rs:33:5:
2024-10-05T14:07:30.4630892Z assertion `left == right` failed
2024-10-05T14:07:30.4631199Z   left: true
2024-10-05T14:07:30.4632659Z  right: false
2024-10-05T14:07:30.4632897Z 
2024-10-05T14:07:30.4632913Z 
2024-10-05T14:07:30.4633046Z failures:
2024-10-05T14:07:30.4633383Z     core::config::tests::download_ci_llvm

Variants of this issue appear with surprising regularity, this is probably already the tenth time that bootstrap tests fail if and only if the LLVM submodule is updated.

We probably need a CI job that adds a dummy commit to the submodule and verifies that bootstrap tests still pass after that.

[onur-ozkan]

Any idea if that happened before #130383?

[dianqk]

Any idea if that happened before #130383?

This happened once before #130383: #130641 (comment).

[nikic]

I've filed #131545 for the "test this in CI" part of the issue.