Access stable_crate_id directly.

Author: cjgillot

compiler/rustc_middle/src/ty/context.rs

@@ -53,6 +53,7 @@ use rustc_serialize::opaque::{FileEncodeResult, FileEncoder};
 use rustc_session::config::{BorrowckMode, CrateType, OutputFilenames};
 use rustc_session::lint::{Level, Lint};
 use rustc_session::Session;
+use rustc_span::def_id::StableCrateId;
 use rustc_span::source_map::MultiSpan;
 use rustc_span::symbol::{kw, sym, Ident, Symbol};
 use rustc_span::{Span, DUMMY_SP};
@@ -1264,6 +1265,11 @@ impl<'tcx> TyCtxt<'tcx> {
         }
     }
 
+    #[inline]
+    pub fn stable_crate_id(self, cnum: CrateNum) -> StableCrateId {
+        self.def_path_hash(cnum.as_def_id()).stable_crate_id()
+    }
+
     pub fn def_path_debug_str(self, def_id: DefId) -> String {
         // We are explicitly not going through queries here in order to get
         // crate name and disambiguator since this code is called from debug!()

compiler/rustc_middle/src/ty/query/on_disk_cache.rs

@@ -1022,8 +1022,7 @@ where
     E: 'a + OpaqueEncoder,
 {
     fn encode(&self, s: &mut CacheEncoder<'a, 'tcx, E>) -> Result<(), E::Error> {
-        let def_path_hash = s.tcx.def_path_hash(self.as_def_id());
-        def_path_hash.stable_crate_id().encode(s)
+        s.tcx.stable_crate_id(*self).encode(s)
     }
 }