Revert "Merge CrateDisambiguator into StableCrateId"

This reverts commit d0ec85d3fb.

compiler/rustc_save_analysis/src/dump_visitor.rs

@@ -142,7 +142,12 @@ impl<'tcx> DumpVisitor<'tcx> {
         let data = CratePreludeData {
             crate_id: GlobalCrateId {
                 name: name.into(),
-                disambiguator: (self.tcx.sess.local_stable_crate_id().to_u64(), 0),
+                disambiguator: self
+                    .tcx
+                    .sess
+                    .local_crate_disambiguator()
+                    .to_fingerprint()
+                    .as_value(),
             },
             crate_root: crate_root.unwrap_or_else(|| "<no source>".to_owned()),
             external_crates: self.save_ctxt.get_external_crates(),

compiler/rustc_save_analysis/src/lib.rs

@@ -127,10 +127,7 @@ impl<'tcx> SaveContext<'tcx> {
                 num: n.as_u32(),
                 id: GlobalCrateId {
                     name: self.tcx.crate_name(n).to_string(),
-                    disambiguator: (
-                        self.tcx.def_path_hash(n.as_def_id()).stable_crate_id().to_u64(),
-                        0,
-                    ),
+                    disambiguator: self.tcx.crate_disambiguator(n).to_fingerprint().as_value(),
                 },
             });
         }