Auto merge of #147518 - dianqk:update-llvm, r=<try>

Update LLVM to 21.1.3

try-job: x86_64-gnu-distcheck

Author: rust-bors[bot]

.github/workflows/ci.yml

@@ -246,6 +246,8 @@ jobs:
         run: src/ci/scripts/create-doc-artifacts.sh
 
       - name: print disk usage
+        # We also want to know the disk usage when the job fails.
+        if: always()
         run: |
           echo "disk usage:"
           df -h

src/bootstrap/src/core/build_steps/test.rs

@@ -3259,6 +3259,8 @@ fn distcheck_plain_source_tarball(builder: &Builder<'_>, plain_src_dir: &Path) {
         .env("GITHUB_ACTIONS", "0")
         .current_dir(plain_src_dir)
         .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    fs::remove_dir_all(plain_src_dir).unwrap();
 }
 
 /// Check that rust-src has all of libstd's dependencies
@@ -3284,6 +3286,8 @@ fn distcheck_rust_src(builder: &Builder<'_>, src_dir: &Path) {
         .arg(&toml)
         .current_dir(src_dir)
         .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    fs::remove_dir_all(src_dir).unwrap();
 }
 
 /// Check that rustc-dev's compiler crate source code can be loaded with `cargo metadata`
@@ -3308,6 +3312,8 @@ fn distcheck_rustc_dev(builder: &Builder<'_>, dir: &Path) {
         .env("RUSTC", &builder.initial_rustc)
         .current_dir(dir)
         .run(builder);
+    // Mitigate pressure on small-capacity disks.
+    fs::remove_dir_all(dir).unwrap();
 }
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]