Rollup merge of rust-lang#47835 - Mark-Simulacrum:remove-data-structs, r=nikomatsakis

Remove unused data structures

Cleanup; as far as I can tell the compiler no longer uses these.

Author: kennytm

src/librustc_data_structures/blake2b.rs

@@ -57,7 +57,6 @@ pub mod small_vec;
 pub mod base_n;
 pub mod bitslice;
 pub mod bitvec;
-pub mod blake2b;
 pub mod graph;
 pub mod indexed_set;
 pub mod indexed_vec;
@@ -70,7 +69,6 @@ pub mod transitive_relation;
 pub mod unify;
 pub mod fx;
 pub mod tuple_slice;
-pub mod veccell;
 pub mod control_flow_graph;
 pub mod flock;
 pub mod sync;