fix(phase-285): restore weak_basic_llvm + complete LLVM detection/quick SSOT

src/runtime/host_handles.rs

@@ -73,3 +73,8 @@ pub fn get(h: u64) -> Option<Arc<dyn NyashBox>> {
 pub fn snapshot() -> Vec<Arc<dyn NyashBox>> {
     reg().snapshot()
 }
+
+/// Drop a handle from the registry, decrementing its reference count
+pub fn drop_handle(h: u64) {
+    reg().drop_handle(h)
+}