implement primop (filter)

fix-codegen/src/disassembler.rs

@@ -281,6 +281,9 @@ impl<'a, Ctx: DisassemblerContext> Disassembler<'a, Ctx> {
             }
 
             Op::Call => ("Call", String::new()),
+            Op::DispatchPrimOp => {
+                todo!();
+            }
 
             Op::MakeAttrs => {
                 let count = self.read_u32();

fix-codegen/src/lib.rs

@@ -42,6 +42,7 @@ pub enum Op {
     MakePatternClosure,
 
     Call,
+    DispatchPrimOp,
 
     MakeAttrs,
     MakeEmptyAttrs,
@@ -125,7 +126,11 @@ pub enum Const {
     Float(f64),
     Bool(bool),
     String(StringId),
-    PrimOp { id: BuiltinId, arity: u8 },
+    PrimOp {
+        id: BuiltinId,
+        arity: u8,
+        dispatch_ip: u32,
+    },
     Null,
 }