[beta] backports

[cuviper]

• Avoid arming the Windows TLS destructor guard in fibers Avoid arming the Windows TLS destructor guard in fibers #161451
• (partial) stdarch subtree update stdarch subtree update #161558
• Check to ensure we're running against the correct LLVM version Check to ensure we're running against the correct LLVM version #161788
• Make the LLVM version mismatch ICE a fatal error Make the LLVM version mismatch ICE a fatal error #162034
• Revert "Add rustc_test_entrypoint_marker" Revert "Add rustc_test_entrypoint_marker" #161931
• Fix ICE of getting name from RPITIT Fix ICE of getting item name from RPITIT #162071
• Update LLVM submodule Update LLVM submodule #162133
• Revert "Implement Debug for C-like enums with a concatenated string" Revert "Implement Debug for C-like enums with a concatenated string" #162164

r? me

[rustbot]

⚠️ Warning ⚠️

• Some commits in this PR modify submodules.

  If this was not intentional, see I changed a submodule on accident in the rustc dev guide.

• There are issue links (such as #123) in the commit messages of the following commits.
  Please move them to the PR description, to avoid spamming the issues with references to the commit, and so this bot can automatically canonicalize them to avoid issues with subtree.

  • e667477

[cuviper]

@bors r+ rollup=never

[rust-bors]

📌 Commit e667477 has been approved by cuviper

It is now in the queue for this repository.

[rust-log-analyzer]

The job x86_64-msvc-ext1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

   Compiling http v0.1.21
error: cannot find macro `vec` in this scope
##[error]   --> C:\Users\runneradmin\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tinyvec-1.13.0\src\tinyvec.rs:710:21
    |
710 |       TinyVec::Heap(vec![A::Item::default(); len])
    |                     ^^^
    |
note: `vec` is imported here, but it is a module, not a macro
   --> C:\Users\runneradmin\.cargo\registry\src\index.crates.io-1949cf8c6b5b557f\tinyvec-1.13.0\src\tinyvec.rs:3:18
    |
---
Command `D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage1-tools-bin\cargotest.exe D:\a\rust\rust\build\x86_64-pc-windows-msvc\stage2-tools-bin\cargo.exe D:\a\rust\rust\build\ct` failed with exit code 101
Created at: src\bootstrap\src\core\build_steps\tool.rs:1607:23
Executed at: src\bootstrap\src\core\build_steps\test.rs:338:29

Command has failed. Rerun with -v to see more details.
Bootstrap failed while executing `--stage 2 test src/tools/cargotest src/tools/cargo`
Currently active steps:
test::Cargotest { build_compiler: Compiler { stage: 1, host: x86_64-pc-windows-msvc, forced_compiler: false }, host: x86_64-pc-windows-msvc } at src\bootstrap\src\core\build_steps\test.rs:299
Build completed unsuccessfully in 1:17:01
  local time: Thu Sep  3 23:18:12 CUT 2026

[rust-bors]

💔 Test for 5a4caa7 failed: CI. Failed job:

• auto - x86_64-msvc-ext1 (web logs, enhanced plaintext logs)

[jnkel]

CI failure is caused by an update to an external dependency of a test; needs either a backport of #162265 (to add a lockfile) or for Lokathor/tinyvec#226 to get merged and released (to fix the dependency).

[JonathanBrouwer]

@bors retry
The external dependency is updated