Drop rustc_hashes dependency

Author: lnicola

Cargo.toml

@@ -85,7 +85,6 @@ vfs-notify = { path = "./crates/vfs-notify", version = "0.0.0" }
 vfs = { path = "./crates/vfs", version = "0.0.0" }
 edition = { path = "./crates/edition", version = "0.0.0" }
 
-ra-ap-rustc_hashes = { version = "0.100", default-features = false }
 ra-ap-rustc_lexer = { version = "0.100", default-features = false }
 ra-ap-rustc_parse_format = { version = "0.100", default-features = false }
 ra-ap-rustc_index = { version = "0.100", default-features = false }

crates/hir-def/src/lib.rs

@@ -18,9 +18,6 @@ extern crate ra_ap_rustc_parse_format as rustc_parse_format;
 #[cfg(feature = "in-rust-tree")]
 extern crate rustc_abi;
 
-#[cfg(feature = "in-rust-tree")]
-extern crate rustc_hashes;
-
 #[cfg(not(feature = "in-rust-tree"))]
 extern crate ra_ap_rustc_abi as rustc_abi;