Auto merge of rust-lang#145298 - nikic:llvm21-rc3, r=cuviper

Update to LLVM 21.1.0 rc3

Author: bors

src/ci/docker/scripts/freebsd-toolchain.sh

@@ -28,7 +28,9 @@ exit 1
 # First up, build binutils
 mkdir binutils
 cd binutils
-curl https://ftp.gnu.org/gnu/binutils/binutils-${binutils_version}.tar.bz2 | tar xjf -
+# Originally downloaded from:
+# https://sourceware.org/pub/binutils/releases/binutils-${binutils_version}.tar.bz2
+curl https://ci-mirrors.rust-lang.org/rustc/binutils-${binutils_version}.tar.bz2 | tar xjf -
 mkdir binutils-build
 cd binutils-build
 hide_output ../binutils-${binutils_version}/configure \