implement primop (filter)

fix-vm/src/bytecode_reader.rs

@@ -139,8 +139,4 @@ impl<'a> BytecodeReader<'a> {
     pub(crate) fn inst_start_pc(&self) -> usize {
         self.inst_start_pc
     }
-
-    pub(crate) fn bytecode(&self) -> &'a [u8] {
-        self.bytecode
-    }
 }