fix llvm ThinLTO behaviour

Signed-off-by: onur-ozkan <work@onurozkan.dev>

Author: onur-ozkan

src/bootstrap/src/core/config/config.rs

@@ -1916,8 +1916,7 @@ impl Config {
 }
 }
 
-// NOTE: can never be hit when downloading from CI, since we call `check_ci_llvm!(thin_lto)` above.
-if config.llvm_thin_lto && link_shared.is_none(){
+if !config.llvm_from_ci && config.llvm_thin_lto && link_shared.is_none(){
 // If we're building with ThinLTO on, by default we want to link
 // to LLVM shared, to avoid re-doing ThinLTO (which happens in
 // the link step) with each stage.