[beta] backports#147284

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cuviper wants to merge 8 commits intorust-lang:betafrom

cuviper:beta-next

Commits on Oct 2, 2025

yeet fastpath

lcnr
authored and
cuviper
committed
remove test for no_core

lcnr
authored and
cuviper
committed
add test

lcnr
authored and
cuviper
committed
Update LLVM to 21.1.2

dianqk
authored and
cuviper
committed
Fix infinite recursion in Path::eq with String

el-ev
authored and
cuviper
committed

Commits on Oct 5, 2025

Update cargo submodule from branch `rust-1.91.0`
cuviper
committed

Commits on Oct 6, 2025

Add failing regression test for #[link="dl"]

JonathanBrouwer
authored and
cuviper
committed
Make `#[link="dl"]` a warning rather than an error

JonathanBrouwer
authored and
cuviper
committed