experimental shipping of more CMake files for Enzyme

src/bootstrap/download-ci-llvm-stamp

@@ -1,4 +1,4 @@
 Change this file to make users of the `download-ci-llvm` configuration download
 a new version of LLVM from CI, even if the LLVM submodule hasn’t changed.
 
-Last change is for: https://github.com/rust-lang/rust/pull/139931
+Last change is for: https://github.com/rust-lang/rust/pull/148027

src/bootstrap/src/core/build_steps/dist.rs

@@ -2582,6 +2582,14 @@ impl Step for RustDev {
                 }
             }
         }
+        // The Enzyme(autodiff) cmake requires the LLVMConfig.cmake file to find tablegen
+        // and other utilities. We therefore also add all cmake files
+        // so that you can use the downloadable LLVM as if you’ve just run a full source build.
+        let cmake_dir = PathBuf::new().join("lib").join("cmake").join("llvm");
+        let cmake_src_dir = builder.llvm_out(target).join(&cmake_dir);
+        if cmake_src_dir.exists() {
+            tarball.add_dir(cmake_src_dir, cmake_dir);
+        }
 
         if builder.config.lld_enabled {
             // We want to package `lld` to use it with `download-ci-llvm`.