Auto merge of rust-lang#122236 - matthiaskrgr:rollup-cg2zzhq, r=matthiaskrgr

Rollup of 11 pull requests

Successful merges:

 - rust-lang#121567 (Avoid some interning in bootstrap)
 - rust-lang#121813 (Misc improvements to non local defs lint implementation)
 - rust-lang#121860 (Add a tidy check that checks whether the fluent slugs only appear once)
 - rust-lang#121907 (skip sanity check for non-host targets in `check` builds)
 - rust-lang#122160 (Eagerly translate `HelpUseLatestEdition` in parser diagnostics)
 - rust-lang#122178 (ci: add a runner for vanilla LLVM 18)
 - rust-lang#122186 (Remove a workaround for a bug)
 - rust-lang#122187 (Move metadata header and version checks together)
 - rust-lang#122215 (Some tweaks to the parallel query cycle handler)
 - rust-lang#122223 (Fix typo in `VisitorResult`)
 - rust-lang#122232 (library/core: fix a comment, and a cfg(miri) warning)

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

Author: bors

.github/workflows/ci.yml

@@ -315,6 +315,10 @@ jobs:
           - name: x86_64-gnu-distcheck
             os: ubuntu-20.04-8core-32gb
             env: {}
+          - name: x86_64-gnu-llvm-18
+            env:
+              RUST_BACKTRACE: 1
+            os: ubuntu-20.04-8core-32gb
           - name: x86_64-gnu-llvm-17
             env:
               RUST_BACKTRACE: 1

Cargo.lock

@@ -4133,7 +4133,6 @@ dependencies = [
  "rustc_target",
  "rustc_trait_selection",
  "rustc_type_ir",
- "smallvec",
  "tracing",
  "unicode-security",
 ]