Allow non-x86_64 loader

Indexer-PiperOrigin-RevId: 839756050

Author: OSS-Fuzz Team

infra/indexer/index/file_copier.cc

@@ -104,6 +104,11 @@ void FileCopier::CopyIndexedFiles() {
 
     DLOG(INFO) << "\nFrom: " << src_path << "\n  To: " << dst_path << "\n";
 
+    if (!std::filesystem::exists(src_path)) {
+      LOG(WARNING) << "Skipping non-existent file: " << src_path;
+      continue;
+    }
+
     QCHECK(std::filesystem::exists(src_path))
         << "Source file does not exist: " << src_path;