rustc: rename ty::populate_implementations_for_type_if_necessary to make it clear that it only populates inherent impls.

This syntax was removed in b24a3b82 but references remained in the
grammar, the reference, rustdoc generation, and some auxiliary test
files that don't seem to have been used since 812637e6.

Thanks!! 💟 

This was causing function calls to be emitted for bitwise complements, even with optimizations on.
Steps to reproduce:
```
$ cat wrapping.rs
fn main() {
    let a = std::num::Wrapping(std::env::args().len() as u32);
    let b = !a;
    println!("{}", b.0);
}
$ rustc -O wrapping.rs --emit=asm,link
$ grep Not wrapping.s
        callq   _ZN3num8wrapping23Wrapping$LT$u32$GT$.Not3not20hba4b266232e02b1dHkbE
```

This stung me more than once in dev.

Bonus DRY'ing up of configure that I did on my way past.

This syntax was removed in b24a3b82 but references remained in the
grammar, the reference, rustdoc generation, and some auxiliary test
files that don't seem to have been used since 812637e6.

r? @aturon 

This fixes the `distcheck` target and nightly builds.

- Successful merges: #24864, #25140, #25179, #25181, #25190, #25194, #25195, #25198, #25203, #25210, #25211, #25215
- Failed merges: #25200

Fix wrong radius valve from 0.0 to 1.0 as above

Many many many people ask in #rust about this libraries, having an
explanatory reason will probably help a lot.

fixed a doc mistake in libcore/marker.mk

Properly sorted, Ł goes between L and M.

Tiny tiny nitpick that I just noticed after getting a new laptop ( 🍺 + 💻 = 👼 ) and thus needing to ./configure anew on Yosemite. 

It's weird to see a message that says you're on 10.9 if you're on 10.10, in a oh-i-wonder-what-else-is-wrong sort of sense-- easy fix with a `>=` since `gcc --version` on 10.10 with the newest xcode still says it's clang.

❤ 

I deleted one unneccessary 'the' and added the href for [bindings]

… compared

cc #24407 

Following paragraph says "we've used `*` which..." but code says "rand=\"0.3.0\""

Building with `--target=mipsel-unknown-linux-gnu` currently results in the following errors, fixed by this PR:

```
rustc: x86_64-unknown-linux-gnu/stage2/lib/rustlib/mipsel-unknown-linux-gnu/lib/libstd
/vol/rust/src/libstd/os/linux/raw.rs:76:21: 76:28 error: use of undeclared type name `c_ulong`
/vol/rust/src/libstd/os/linux/raw.rs:76         pub st_dev: c_ulong,
                                                            ^~~~~~~
/vol/rust/src/libstd/os/linux/raw.rs:83:22: 83:29 error: use of undeclared type name `c_ulong`
/vol/rust/src/libstd/os/linux/raw.rs:83         pub st_rdev: c_ulong,
                                                             ^~~~~~~
/vol/rust/src/libstd/sys/common/net2.rs:210:52: 210:70 error: unresolved name `libc::TCP_KEEPIDLE`
/vol/rust/src/libstd/sys/common/net2.rs:210         setsockopt(&self.inner, libc::IPPROTO_TCP, libc::TCP_KEEPIDLE,
```

If you have 0 references (`&T`) to a resource, presumably, you could have a mutable reference (`&mut T`). So this only start to make sense at having 1 reference to a resource.

This commit is an implementation of [RFC 1066][rfc] where the conclusion was
that leaking a value is a safe operation in Rust code, so updating the signature
of this function follows suit.

[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1066-safe-mem-forget.md

Closes #25186

This fixes the `distcheck` target and nightly builds.

Fix wrong radius valve from 0.0 to 1.0 as above

Many many many people ask in #rust about this libraries, having an
explanatory reason will probably help a lot.

Properly sorted, Ł goes between L and M.

If you have 0 references (`&T`) to a resource, presumably, you could
have a mutable reference (`&mut T`). So this only start to make sense
at having 1 reference to a resource.

* Remove the 2-suffix from some modules
* Remove some unused files
* Remove double-boxing for `ReentrantMutex`

This commit is an implementation of [RFC 1066][rfc] where the conclusion was
that leaking a value is a safe operation in Rust code, so updating the signature
of this function follows suit.

[rfc]: https://github.com/rust-lang/rfcs/blob/master/text/1066-safe-mem-forget.md

Closes #25186

Fix #25076.

r? @nikomatsakis 

10.10 is out, so it's weird to see a message that says you're on 10.9.
Change the message to be >=10.9.