librustc: Remove unused field enum_sizes from the crate context

Author: pcwalton

src/librustc/middle/trans/context.rs

@@ -52,7 +52,6 @@ pub struct CrateContext {
      reachable: @mut HashSet<ast::NodeId>,
      item_symbols: RefCell<HashMap<ast::NodeId, ~str>>,
      link_meta: LinkMeta,
-     enum_sizes: HashMap<ty::t, uint>,
      discrims: HashMap<ast::DefId, ValueRef>,
      discrim_symbols: HashMap<ast::NodeId, @str>,
      tydescs: HashMap<ty::t, @mut tydesc_info>,
@@ -192,7 +191,6 @@ impl CrateContext {
                   reachable: reachable,
                   item_symbols: RefCell::new(HashMap::new()),
                   link_meta: link_meta,
-                  enum_sizes: HashMap::new(),
                   discrims: HashMap::new(),
                   discrim_symbols: HashMap::new(),
                   tydescs: HashMap::new(),