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.

1 files changed, 1 insertions, 39 deletions

diff --git a/compiler/rustc_ast/src/attr/mod.rs b/compiler/rustc_ast/src/attr/mod.rs
index 2c5e180f80d..0fbe4d0120c 100644
--- a/compiler/rustc_ast/src/attr/mod.rs
+++ b/compiler/rustc_ast/src/attr/mod.rs
@@ -100,16 +100,7 @@ impl NestedMetaItem {
         self.meta_item().map_or(false, |meta_item| meta_item.is_word())
     }
 
-    /// Returns `true` if `self` is a `MetaItem` and the meta item is a `ValueString`.
-    pub fn is_value_str(&self) -> bool {
-        self.value_str().is_some()
-    }
-
-    /// Returns `true` if `self` is a `MetaItem` and the meta item is a list.
-    pub fn is_meta_item_list(&self) -> bool {
-        self.meta_item_list().is_some()
-    }
-
+    /// See [`MetaItem::name_value_literal_span`].
     pub fn name_value_literal_span(&self) -> Option<Span> {
         self.meta_item()?.name_value_literal_span()
     }
@@ -165,31 +156,6 @@ impl Attribute {
             false
         }
     }
-
-    pub fn is_meta_item_list(&self) -> bool {
-        self.meta_item_list().is_some()
-    }
-
-    /// Indicates if the attribute is a `ValueString`.
-    pub fn is_value_str(&self) -> bool {
-        self.value_str().is_some()
-    }
-
-    /// This is used in case you want the value span instead of the whole attribute. Example:
-    ///
-    /// ```text
-    /// #[doc(alias = "foo")]
-    /// ```
-    ///
-    /// In here, it'll return a span for `"foo"`.
-    pub fn name_value_literal_span(&self) -> Option<Span> {
-        match self.kind {
-            AttrKind::Normal(ref item, _) => {
-                item.meta(self.span).and_then(|meta| meta.name_value_literal_span())
-            }
-            AttrKind::DocComment(..) => None,
-        }
-    }
 }
 
 impl MetaItem {
@@ -236,10 +202,6 @@ impl MetaItem {
         self.path == name
     }
 
-    pub fn is_value_str(&self) -> bool {
-        self.value_str().is_some()
-    }
-
     /// This is used in case you want the value span instead of the whole attribute. Example:
     ///
     /// ```text