feat(tvix/eval): track source spans for unary operators

Change-Id: I79034a4aa04aea66ec598e33e6eab35e1e19c0d0
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6383
Tested-by: BuildkiteCI
Reviewed-by: sterni <sternenseemann@systemli.org>

tvix/eval/src/compiler/mod.rs

@@ -256,7 +256,7 @@ impl Compiler<'_> {
             ast::UnaryOpKind::Negate => OpCode::OpNegate,
         };
 
-        self.push_op_old(opcode);
+        self.push_op(opcode, &op);
     }
 
     fn compile_binop(&mut self, slot: Option<LocalIdx>, op: ast::BinOp) {