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_ast_pretty/src/pprust/mod.rs

@@ -22,10 +22,6 @@ pub fn token_to_string(token: &Token) -> String {
     State::new().token_to_string(token)
 }
 
-pub fn token_to_string_ext(token: &Token, convert_dollar_crate: bool) -> String {
-    State::new().token_to_string_ext(token, convert_dollar_crate)
-}
-
 pub fn ty_to_string(ty: &ast::Ty) -> String {
     State::new().ty_to_string(ty)
 }
@@ -50,18 +46,10 @@ pub fn tts_to_string(tokens: &TokenStream) -> String {
     State::new().tts_to_string(tokens)
 }
 
-pub fn stmt_to_string(stmt: &ast::Stmt) -> String {
-    State::new().stmt_to_string(stmt)
-}
-
 pub fn item_to_string(i: &ast::Item) -> String {
     State::new().item_to_string(i)
 }
 
-pub fn generic_params_to_string(generic_params: &[ast::GenericParam]) -> String {
-    State::new().generic_params_to_string(generic_params)
-}
-
 pub fn path_to_string(p: &ast::Path) -> String {
     State::new().path_to_string(p)
 }
@@ -74,26 +62,14 @@ pub fn vis_to_string(v: &ast::Visibility) -> String {
     State::new().vis_to_string(v)
 }
 
-pub fn block_to_string(blk: &ast::Block) -> String {
-    State::new().block_to_string(blk)
-}
-
 pub fn meta_list_item_to_string(li: &ast::NestedMetaItem) -> String {
     State::new().meta_list_item_to_string(li)
 }
 
-pub fn attr_item_to_string(ai: &ast::AttrItem) -> String {
-    State::new().attr_item_to_string(ai)
-}
-
 pub fn attribute_to_string(attr: &ast::Attribute) -> String {
     State::new().attribute_to_string(attr)
 }
 
-pub fn param_to_string(arg: &ast::Param) -> String {
-    State::new().param_to_string(arg)
-}
-
 pub fn to_string(f: impl FnOnce(&mut State<'_>)) -> String {
     State::new().to_string(f)
 }

compiler/rustc_ast_pretty/src/pprust/state.rs

@@ -2292,10 +2292,6 @@ impl<'a> State<'a> {
         }
     }
 
-    pub fn print_usize(&mut self, i: usize) {
-        self.s.word(i.to_string())
-    }
-
     crate fn print_name(&mut self, name: Symbol) {
         self.s.word(name.to_string());
         self.ann.post(self, AnnNode::Name(&name))