Auto merge of #143684 - nikic:llvm-21, r=cuviper

Update to LLVM 21

Timeline: LLVM 21.1.0 is scheduled to release on Aug 26th. Rust 1.90 branches on Aug 1st and releases September 18.

Depends on:
 * [x] llvm/llvm-project#147781
 * [x] llvm/llvm-project#147935
 * [x] llvm/llvm-project#139443
 * [x] llvm/llvm-project#148207
 * [x] llvm/llvm-project#148607
 * [x] llvm/llvm-project#149046
 * [x] llvm/llvm-project#149097
 * [x] #144116

r? `@ghost`

Author: bors

.gitmodules

@@ -25,7 +25,7 @@
 [submodule "src/llvm-project"]
 	path = src/llvm-project
 	url = https://github.com/rust-lang/llvm-project.git
-	branch = rustc/20.1-2025-07-13
+	branch = rustc/21.1-2025-08-01
 	shallow = true
 [submodule "src/doc/embedded-book"]
 	path = src/doc/embedded-book

src/ci/docker/scripts/build-clang.sh

@@ -5,7 +5,7 @@ set -ex
 source shared.sh
 
 # Try to keep the LLVM version here in sync with src/ci/scripts/install-clang.sh
-LLVM=llvmorg-20.1.0-rc2
+LLVM=llvmorg-21.1.0-rc2
 
 mkdir llvm-project
 cd llvm-project