Removes 'elided' from lifetime resolution errors
Removes 'elided' from relevant error messaging tests

Also moves a few transmute tests to UI tests to better test their
output.

…matsakis

Print the two types in the span label for transmute errors.

Fixes rust-lang#37157. I'm not entirely happy with the changes here but overall it's better in my opinion; we certainly avoid the odd language in that issue, which changes to:

```
error[E0512]: transmute called with differently sized types: <C as TypeConstructor<'a>>::T (size can vary because of <C as TypeConstructor>::T) to <C as TypeConstructor<'b>>::T (size can vary because of <C as TypeConstructor>::T)
 --> test.rs:8:5
  |
8 |     ::std::mem::transmute(x)
  |     ^^^^^^^^^^^^^^^^^^^^^ transmuting between <C as TypeConstructor<'a>>::T and <C as TypeConstructor<'b>>::T

error: aborting due to previous error(s)
```

Remove 'elided' from lifetime resolution error

Removes 'elided' from lifetime resolution errors
Removes 'elided' from relevant error messaging tests

This PR resolves rust-lang#29094

r? @Mark-Simulacrum

…hton

rustc_llvm: re-run build script if config.toml changes

closes rust-lang#35199

doc rewording