Migrate off of RawTable APIs

Summary:
The `RawTable` APIs are removed in latest `hashbrown` upgrade (coming in D68793000). rust-lang/hashbrown#546

The PR notes that users should migrate to the `HashTable` APIs instead.

- `HashTable`: https://docs.rs/hashbrown/latest/hashbrown/struct.HashTable.html
- `RawTable`: https://docs.rs/hashbrown/0.14.5/hashbrown/raw/struct.RawTable.html

Reviewed By: dtolnay

Differential Revision: D69195912

fbshipit-source-id: b5c4d0cc33a977d9ceb247ffedcf49d7be0b01ec

Author: capickett

allocative/src/impls/hashbrown.rs

@@ -11,7 +11,6 @@
 
 use std::mem;
 
-use hashbrown::raw::RawTable;
 use hashbrown::HashTable;
 
 use crate::Allocative;
@@ -20,28 +19,6 @@ use crate::Visitor;
 
 const CAPACITY_NAME: Key = Key::new("capacity");
 
-impl<T: Allocative> Allocative for RawTable<T> {
-    fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
-        use crate::impls::common::DATA_NAME;
-        use crate::impls::hashbrown_util;
-
-        let mut visitor = visitor.enter_self_sized::<Self>();
-        {
-            let mut visitor = visitor.enter_unique(DATA_NAME, mem::size_of::<*const T>());
-            {
-                let mut visitor = visitor.enter(
-                    CAPACITY_NAME,
-                    hashbrown_util::raw_table_alloc_size_for_len::<T>(self.capacity()),
-                );
-                unsafe { visitor.visit_iter(self.iter().map(|e| e.as_ref())) };
-                visitor.exit();
-            }
-            visitor.exit();
-        }
-        visitor.exit();
-    }
-}
-
 impl<T: Allocative> Allocative for HashTable<T> {
     fn visit<'a, 'b: 'a>(&self, visitor: &'a mut Visitor<'b>) {
         use crate::impls::common::DATA_NAME;
@@ -70,7 +47,6 @@ mod tests {
     use std::hash::Hash;
     use std::hash::Hasher;
 
-    use hashbrown::raw::RawTable;
     use hashbrown::HashTable;
 
     use crate::golden::golden_test;
@@ -81,16 +57,6 @@ mod tests {
         hasher.finish()
     }
 
-    #[test]
-    fn test_raw_table() {
-        let mut table = RawTable::with_capacity(100);
-        for i in 0..100 {
-            table.insert(hash(&i.to_string()), i.to_string(), hash);
-        }
-
-        golden_test!(&table);
-    }
-
     #[test]
     fn test_hash_table() {
         let mut table = HashTable::with_capacity(100);