Make Decodable and Decoder infallible.

`Decoder` has two impls:
- opaque: this impl is already partly infallible, i.e. in some places it
  currently panics on failure (e.g. if the input is too short, or on a
  bad `Result` discriminant), and in some places it returns an error
  (e.g. on a bad `Option` discriminant). The number of places where
  either happens is surprisingly small, just because the binary
  representation has very little redundancy and a lot of input reading
  can occur even on malformed data.
- json: this impl is fully fallible, but it's only used (a) for the
  `.rlink` file production, and there's a `FIXME` comment suggesting it
  should change to a binary format, and (b) in a few tests in
  non-fundamental ways. Indeed #85993 is open to remove it entirely.

And the top-level places in the compiler that call into decoding just
abort on error anyway. So the fallibility is providing little value, and
getting rid of it leads to some non-trivial performance improvements.

Much of this commit is pretty boring and mechanical. Some notes about
a few interesting parts:
- The commit removes `Decoder::{Error,error}`.
- `InternIteratorElement::intern_with`: the impl for `T` now has the same
  optimization for small counts that the impl for `Result<T, E>` has,
  because it's now much hotter.
- Decodable impls for SmallVec, LinkedList, VecDeque now all use
  `collect`, which is nice; the one for `Vec` uses unsafe code, because
  that gave better perf on some benchmarks.

compiler/rustc_index/src/vec.rs

@@ -395,8 +395,8 @@ macro_rules! newtype_index {
 
     (@serializable $type:ident) => (
         impl<D: ::rustc_serialize::Decoder> ::rustc_serialize::Decodable<D> for $type {
-            fn decode(d: &mut D) -> Result<Self, D::Error> {
-                d.read_u32().map(Self::from_u32)
+            fn decode(d: &mut D) -> Self {
+                Self::from_u32(d.read_u32())
             }
         }
         impl<E: ::rustc_serialize::Encoder> ::rustc_serialize::Encodable<E> for $type {
@@ -527,8 +527,8 @@ impl<S: Encoder, I: Idx, T: Encodable<S>> Encodable<S> for &IndexVec<I, T> {
 }
 
 impl<D: Decoder, I: Idx, T: Decodable<D>> Decodable<D> for IndexVec<I, T> {
-    fn decode(d: &mut D) -> Result<Self, D::Error> {
-        Decodable::decode(d).map(|v| IndexVec { raw: v, _marker: PhantomData })
+    fn decode(d: &mut D) -> Self {
+        IndexVec { raw: Decodable::decode(d), _marker: PhantomData }
     }
 }