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_graphviz/src/tests.rs

@@ -111,7 +111,7 @@ impl<'a> Labeller<'a> for LabelledGraph {
     fn node_label(&'a self, n: &Node) -> LabelText<'a> {
         match self.node_labels[*n] {
             Some(l) => LabelStr(l.into()),
-            None => LabelStr(id_name(n).name()),
+            None => LabelStr(id_name(n).name),
         }
     }
     fn edge_label(&'a self, e: &&'a Edge) -> LabelText<'a> {