This reverts commit ea9519b.

Also remove `never_type` the feature-gate test.

…li-obk

Stabilize `!` in Rust 1.41.0

This PR stabilizes the `never_type` (written `!`). The type represents computations that we know diverge in the type system and therefore has no values / inhabitants / elements / members.

The current nightly version is 1.40.0 which will become stable on 2019-12-19.

Tracking issue: rust-lang#35121.
Closes rust-lang#57012.
Closes rust-lang#58184.
Original stabilization report: rust-lang#57012 (comment)

Additional notes:

- In rust-lang#62661 we reserved `impl<T> From<!> for T` so this concern should be resolved.
- The type inference fallback change is moved to `#![feature(never_type_fallback)]` (rust-lang#65992).
- You can find all of the tests referencing `never_type` in this PR which also reorganizes these tests whereas they were more scattered before.

r? @nikomatsakis

Suggest to add lifetime constraint at explicit ouput of functions

Closes rust-lang#62097

Cleanup Miri SIMD intrinsics

r? @oli-obk @eddyb Cc @gnzlbg

Reduce size of `hir::Expr` by boxing more of `hir::InlineAsm`

r? @oli-obk

…aumeGomez

Revert "Update Source Code Pro and include italics"

This reverts commit ea9519b.