Update rustc-hash to version 2

This brings in the new optimized algorithm that was shown to have small performance benefits for
rustc.

Author: Noratrieb

Cargo.lock

@@ -136,7 +136,7 @@ process-wrap = { version = "8.0.2", features = ["std"] }
 pulldown-cmark-to-cmark = "10.0.4"
 pulldown-cmark = { version = "0.9.0", default-features = false }
 rayon = "1.8.0"
-rustc-hash = "1.1.0"
+rustc-hash = "2.0.0"
 semver = "1.0.14"
 serde = { version = "1.0.192", features = ["derive"] }
 serde_json = "1.0.108"

Cargo.toml

@@ -51,10 +51,7 @@ mod test_db;
 #[cfg(test)]
 mod tests;
 
-use std::{
-    collections::hash_map::Entry,
-    hash::{BuildHasherDefault, Hash},
-};
+use std::{collections::hash_map::Entry, hash::Hash};
 
 use base_db::ra_salsa::InternValueTrivial;
 use chalk_ir::{
@@ -245,7 +242,7 @@ impl MemoryMap {
         match self {
             MemoryMap::Empty => Ok(Default::default()),
             MemoryMap::Simple(m) => transform((&0, m)).map(|(addr, val)| {
-                let mut map = FxHashMap::with_capacity_and_hasher(1, BuildHasherDefault::default());
+                let mut map = FxHashMap::with_capacity_and_hasher(1, rustc_hash::FxBuildHasher);
                 map.insert(addr, val);
                 map
             }),

crates/hir-ty/src/lib.rs

@@ -17,7 +17,7 @@ indexmap = "2.1.0"
 lock_api = "0.4"
 tracing = "0.1"
 parking_lot = "0.12.1"
-rustc-hash = "1.0"
+rustc-hash = "2.0.0"
 smallvec = "1.0.0"
 oorandom = "11"
 triomphe = "0.1.11"