Get rid of actually-unused GPut/GPush opcodes

* These came over from LambdaMOO opcodes list, but aren't even really
  used there.
* They're redundant and just the same as PUT/PUSH
* At some point we'll introduce more sophisticated scoping constructs
  and these will just get in the way

crates/compiler/src/decompile.rs

@@ -794,17 +794,6 @@ impl Decompile {
                 let e = Expr::List(vec![Arg::Splice(sp_expr)]);
                 self.push_expr(e);
             }
-            Op::GPut { id } => {
-                let e = Expr::Assign {
-                    left: Box::new(Expr::Id(id)),
-                    right: Box::new(self.pop_expr()?),
-                };
-                self.push_expr(e);
-            }
-            Op::GPush { id } => {
-                let e = Expr::Id(id);
-                self.push_expr(e)
-            }
             Op::PutProp => {
                 let rvalue = self.pop_expr()?;
                 let propname = self.pop_expr()?;

crates/compiler/src/opcode.rs

@@ -40,8 +40,6 @@ pub enum Op {
     ForRange { id: Name, end_label: Label },
     Fork { fv_offset: Offset, id: Option<Name> },
     FuncCall { id: Name },
-    GPush { id: Name },
-    GPut { id: Name },
     Ge,
     GetProp,
     Gt,

crates/kernel/src/vm/moo_execute.rs

@@ -479,15 +479,6 @@ pub fn moo_frame_execute(
                     }
                 }
             }
-            Op::GPut { id } => {
-                f.set_env(id, f.peek_top().clone());
-            }
-            Op::GPush { id } => {
-                let Some(v) = f.get_env(id) else {
-                    return state.push_error(E_VARNF);
-                };
-                f.push(v.clone());
-            }
             Op::Length(offset) => {
                 let v = f.peek_abs(offset.0 as usize);
                 match v.len() {