Move hashes from rustc_data_structure to rustc_hashes so they can be shared with rust-analyzer

compiler/rustc_hir/src/def_path_hash_map.rs

@@ -1,4 +1,4 @@
-use rustc_data_structures::stable_hasher::Hash64;
+use rustc_hashes::Hash64;
 use rustc_span::def_id::DefIndex;
 
 #[derive(Clone, Default)]

compiler/rustc_hir/src/definitions.rs

@@ -7,8 +7,9 @@
 use std::fmt::{self, Write};
 use std::hash::Hash;
 
-use rustc_data_structures::stable_hasher::{Hash64, StableHasher};
+use rustc_data_structures::stable_hasher::StableHasher;
 use rustc_data_structures::unord::UnordMap;
+use rustc_hashes::Hash64;
 use rustc_index::IndexVec;
 use rustc_macros::{Decodable, Encodable};
 use rustc_span::{Symbol, kw, sym};

compiler/rustc_hir/src/tests.rs

@@ -1,6 +1,6 @@
 #![allow(rustc::symbol_intern_string_literal)]
 
-use rustc_data_structures::stable_hasher::Hash64;
+use rustc_hashes::Hash64;
 use rustc_span::def_id::{DefPathHash, StableCrateId};
 use rustc_span::edition::Edition;
 use rustc_span::{Symbol, create_session_globals_then};