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/mir/visit.rs

@@ -1247,12 +1247,6 @@ impl PlaceContext {
         matches!(self, PlaceContext::MutatingUse(..))
     }
 
-    /// Returns `true` if this place context represents a use that does not change the value.
-    #[inline]
-    pub fn is_nonmutating_use(&self) -> bool {
-        matches!(self, PlaceContext::NonMutatingUse(..))
-    }
-
     /// Returns `true` if this place context represents a use.
     #[inline]
     pub fn is_use(&self) -> bool {