Add lang items to new lang_item table

Author: jacob-hughes

compiler/rustc_hir/src/lang_items.rs

@@ -331,4 +331,8 @@ language_item_table! {
     Range,                   sym::Range,               range_struct,               Target::Struct;
     RangeToInclusive,        sym::RangeToInclusive,    range_to_inclusive_struct,  Target::Struct;
     RangeTo,                 sym::RangeTo,             range_to_struct,            Target::Struct;
+
+    ManageableContents,      sym::manageable_contents, manageable_contents_trait,  Target::Trait;
+    VecWithCapacityGCFnLangItem,      sym::vec_with_capacity_gc, vec_with_capacity_fn,  Target::Fn;
+    VecPushGc,               sym::vec_push_gc,         vec_push_gc_fn,             Target::Fn;
 }

compiler/rustc_span/src/symbol.rs

@@ -647,6 +647,7 @@ symbols! {
         macro_vis_matcher,
         macros_in_extern,
         main,
+        manageable_contents,
         managed_boxes,
         manually_drop,
         map,
@@ -1169,7 +1170,9 @@ symbols! {
         var,
         variant_count,
         vec,
+        vec_push_gc,
         vec_type,
+        vec_with_capacity_gc,
         version,
         vis,
         visible_private_types,