Auto merge of #121866 - Kobzol:opt-dist-find-llvm, r=Mark-Simulacrum

Modify opt-dist logic for finding LLVM artifacts

This is the `rustc` side of fixing #121395 (comment).

src/tools/opt-dist/src/utils/artifact_size.rs

@@ -15,8 +15,21 @@ pub fn print_binary_sizes(env: &Environment) -> anyhow::Result<()> {
 
     let root = env.build_artifacts().join("stage2");
 
+    let all_lib_files = get_files_from_dir(&root.join("lib"), None)?;
+
     let mut files = get_files_from_dir(&root.join("bin"), None)?;
     files.extend(get_files_from_dir(&root.join("lib"), Some(".so"))?);
+
+    // libLLVM.so can be named libLLVM.so.<suffix>, so we try to explicitly add it here if it
+    // wasn't found by the above call.
+    if !files.iter().any(|f| f.file_name().unwrap_or_default().starts_with("libLLVM")) {
+        if let Some(llvm_lib) =
+            all_lib_files.iter().find(|f| f.file_name().unwrap_or_default().starts_with("libLLVM"))
+        {
+            files.push(llvm_lib.clone());
+        }
+    }
+
     files.sort_unstable();
 
     let items: Vec<_> = files