When trying to use a value after move, instead of using a note, point
at the local declaration that has a type that doesn't implement `Copy`
trait.

…k frame

Usually the layout of any locals is required at least three times, once
when it becomes live, once when it is written to, and once it is read
from. By adding a cache for them, we can reduce the number of layout
queries speeding up code that is heavy on const_eval.

…sakis

When using value after move, point at span of local

When trying to use a value after move, instead of using a note, point
at the local declaration that has a type that doesn't implement `Copy`
trait.

```
error[E0382]: use of moved value: `x`
  --> $DIR/issue-34721.rs:27:9
   |
LL |     pub fn baz<T: Foo>(x: T) -> T {
   |                -       - move occurs because `x` has type `T`, which does not implement the `Copy` trait
   |                |
   |                consider adding a `Copy` constraint to this type argument
LL |         if 0 == 1 {
LL |             bar::bar(x.zero())
   |                      - value moved here
LL |         } else {
LL |             x.zero()
   |             - value moved here
LL |         };
LL |         x.zero()
   |         ^ value used here after move
```

Fix rust-lang#34721.

…ietMisdreavus

Default images

Add default rust logo (the image at the top of the sidebar) and default favicon. No more missing image or inexistent icon on the documentation tabs!

r? @QuietMisdreavus

Fix memory leak in P::filter_map

Probably this function isn't widely used, but anyway this wasn't working as intended.

r? @eddyb

Do not rollup if you want to see if max-rss change in perf.

const_eval: Predetermine the layout of all locals when pushing a stack frame

Usually the layout of any locals is required at least three times, once
when it becomes live, once when it is written to, and once it is read
from. By adding a cache for them, we can reduce the number of layout
queries speeding up code that is heavy on const_eval.

…ertj

Merge visitors in AST validation

Cuts runtime for AST validation on `syntex_syntax` from 31.5 ms to 17 ms.

Add regression test for rust-lang#54582

Fix rust-lang#54582.

Use structured suggestion in stead of notes

…ebsd, r=nagisa

Add powerpc64-unknown-freebsd

FreeBSD review: https://reviews.freebsd.org/D18367