add #[inline(never)] annotations

Author: nikomatsakis

src/librustc_mir/borrow_check/nll/region_infer/dfs.rs

@@ -34,6 +34,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
     /// - `Ok(false)` if the walk was completed with no changes;
     /// - `Err(early)` if the walk was existed early by `op`. `earlyelem` is the
     ///   value that `op` returned.
+    #[inline(never)] // ensure dfs is identifiable in profiles
     pub(super) fn dfs<C>(&self, mir: &Mir<'tcx>, mut op: C) -> Result<bool, C::Early>
     where
         C: DfsOp,

src/librustc_mir/borrow_check/nll/region_infer/mod.rs

@@ -452,6 +452,7 @@ impl<'tcx> RegionInferenceContext<'tcx> {
         self.inferred_values = Some(inferred_values);
     }
 
+    #[inline(never)] // ensure dfs is identifiable in profiles
     fn compute_region_values(&self, mir: &Mir<'tcx>, track_causes: TrackCauses) -> RegionValues {
         debug!("compute_region_values()");
         debug!("compute_region_values: constraints={:#?}", {