Add intrinsic calls to Hercules IR

• Add new intrinsic node (with parsing and dumping)
• Add type checking and constant propagation rules for intrinsics

hercules_ir/src/build.rs

@@ -549,6 +549,17 @@ impl NodeBuilder {
         };
     }
 
+    pub fn build_intrinsic(
+        &mut self,
+        intrinsic : Intrinsic,
+        args: Box<[NodeID]>,
+    ) {
+        self.node = Node::IntrinsicCall {
+            intrinsic,
+            args,
+        };
+    }
+
     pub fn build_read(&mut self, collect: NodeID, indices: Box<[Index]>) {
         self.node = Node::Read { collect, indices };
     }