Remove (lots of) dead code

Found with https://github.com/est31/warnalyzer.

Dubious changes:
- Is anyone else using rustc_apfloat? I feel weird completely deleting
  x87 support.
- Maybe some of the dead code in rustc_data_structures, in case someone
  wants to use it in the future?
- Don't change rustc_serialize

  I plan to scrap most of the json module in the near future (see
  https://github.com/rust-lang/compiler-team/issues/418) and fixing the
  tests needed more work than I expected.

TODO: check if any of the comments on the deleted code should be kept.

compiler/rustc_middle/src/ty/mod.rs

@@ -618,22 +618,12 @@ pub struct ProjectionPredicate<'tcx> {
 pub type PolyProjectionPredicate<'tcx> = Binder<ProjectionPredicate<'tcx>>;
 
 impl<'tcx> PolyProjectionPredicate<'tcx> {
-    /// Returns the `DefId` of the associated item being projected.
-    pub fn item_def_id(&self) -> DefId {
-        self.skip_binder().projection_ty.item_def_id
-    }
-
     /// Returns the `DefId` of the trait of the associated item being projected.
     #[inline]
     pub fn trait_def_id(&self, tcx: TyCtxt<'tcx>) -> DefId {
         self.skip_binder().projection_ty.trait_def_id(tcx)
     }
 
-    #[inline]
-    pub fn projection_self_ty(&self) -> Binder<Ty<'tcx>> {
-        self.map_bound(|predicate| predicate.projection_ty.self_ty())
-    }
-
     /// Get the [PolyTraitRef] required for this projection to be well formed.
     /// Note that for generic associated types the predicates of the associated
     /// type also need to be checked.
@@ -1039,10 +1029,6 @@ impl WithOptConstParam<DefId> {
         None
     }
 
-    pub fn expect_local(self) -> WithOptConstParam<LocalDefId> {
-        self.as_local().unwrap()
-    }
-
     pub fn is_local(self) -> bool {
         self.did.is_local()
     }
@@ -1222,11 +1208,6 @@ pub trait WithConstness: Sized {
         ConstnessAnd { constness, value: self }
     }
 
-    #[inline]
-    fn with_const(self) -> ConstnessAnd<Self> {
-        self.with_constness(Constness::Const)
-    }
-
     #[inline]
     fn without_const(self) -> ConstnessAnd<Self> {
         self.with_constness(Constness::NotConst)