Now it is possible to run tests on a jailbroken device

- target_word_size -> target_pointer_width
- added armv7 and armv7s targets
- enabled building binaries so tests could be run on a jailbroken device

Closes #20359

Conflicts:
	src/compiletest/compiletest.rs
	src/libcollections/lib.rs
	src/libserialize/lib.rs
	src/libsyntax/feature_gate.rs

Conflicts:
	src/librustc_trans/trans/expr.rs

Conflicts:
	src/librustc/middle/ty.rs

Conflicts:
	src/librustc_typeck/check/wf.rs

This is a [breaking-change].

Change

    impl<T> Foo<T> {
        fn bar<T>(...

to (for example)

    impl<T> Foo<T> {
        fn bar<U>(...

Per RFC 459.

Closes #19390.

Conflicts:
	src/libcollections/vec.rs
	src/libcore/fmt/mod.rs
	src/librustc/lint/builtin.rs
	src/librustc/session/config.rs
	src/librustc_trans/trans/base.rs
	src/librustc_trans/trans/context.rs
	src/librustc_trans/trans/type_.rs
	src/librustc_typeck/check/_match.rs
	src/librustdoc/html/format.rs
	src/libsyntax/std_inject.rs
	src/libsyntax/util/interner.rs
	src/test/compile-fail/mut-pattern-mismatched.rs

Fixes #20535.

result of using `ty::type_is_sized`

[Rendered RFC](https://github.com/rust-lang/rfcs/blob/master/text/0558-require-parentheses-for-chained-comparisons.md)

Conflicts:
	src/librustdoc/html/format.rs

Conflicts:
	src/libcollections/vec.rs
	src/libcore/fmt/mod.rs
	src/librustdoc/html/format.rs

This changes a line that has `\n#[stable]}` to instead have `}\n#[stable]`.

The #[stable] has been before the bracket since https://github.com/rust-lang/rust/commit/b94bcbf56eab163517e8ffc93888284b8dbb6238.

This is a (very) minor change, and I have not built this locally because of my not-so-powerful machine.

I was reading the ownership guide and found this small typo :bowtie:

Conflicts:
	src/libserialize/lib.rs

These tests have all been failing spuroiusly on Windows from time to time, and
one suspicion is that the shilc thread outliving the main thread somehow causes
the problem. Switch all the tests over to using Thread::scoped instead of
Thread::spawn to see if it helps the issue.

cc #19120

Due to the CSS changes done by the previous patch to make the line numbers clickable (#20092), the sidebar became unclickable. This PR reverts the changes and adopts an alternative approach.

I'm very sorry for having broken things.

This removes the needlessly constricting bound on `intrinsics::type_Id` and `TypeId::of`. Also fixes an ICE where using bounds on type parameters in extern blocks fails to resolve the used traits.

This should be rollup

Issue #20686, proposed by nstoddard.

This is a follow up to my recent PR. r? @nikomatsakis

Closes #20421

[breaking-change]

r? @brson