avoid thunking trivial values

fix-vm/src/bytecode_reader.rs

@@ -112,6 +112,10 @@ impl<'a> BytecodeReader<'a> {
                 let idx = self.read_u32();
                 OperandData::Local { layer, idx }
             }
+            OperandType::BuiltinConst => {
+                let id = self.read_string_id();
+                OperandData::BuiltinConst(id)
+            }
             OperandType::Builtins => OperandData::Builtins,
             OperandType::ReplBinding => {
                 let id = self.read_string_id();

fix-vm/src/lib.rs

@@ -229,6 +229,7 @@ pub(crate) enum OperandData {
     Const(StaticValue),
     BigInt(i64),
     Local { layer: u8, idx: u32 },
+    BuiltinConst(StringId),
     Builtins,
     ReplBinding(StringId),
     ScopedImportBinding(StringId),
@@ -249,6 +250,13 @@ impl OperandData {
                 }
                 cur.borrow().locals[idx as usize]
             }
+            #[allow(clippy::unwrap_used)]
+            BuiltinConst(id) => root
+                .builtins
+                .as_gc::<AttrSet>()
+                .unwrap()
+                .lookup(id)
+                .unwrap(),
             Builtins => root.builtins,
             ReplBinding(_id) => todo!(),
             ScopedImportBinding(_id) => todo!(),