refactor(tvix/eval): emit OpAttrs inside of compile_bindings

This needs to move here so that we can reuse compile_bindings for the
nested attribute sets we're about to start constructing.

Change-Id: Ie83f52f7e1d128886e96a1da47792211fa826f21
Reviewed-on: https://cl.tvl.fyi/c/depot/+/6796
Reviewed-by: sterni <sternenseemann@systemli.org>
Tested-by: BuildkiteCI

tvix/eval/src/compiler/mod.rs

@@ -19,7 +19,7 @@ mod spans;
 
 use codemap::Span;
 use path_clean::PathClean;
-use rnix::ast::{self, AstToken, HasEntry};
+use rnix::ast::{self, AstToken};
 use smol_str::SmolStr;
 use std::collections::HashMap;
 use std::path::{Path, PathBuf};